diff --git a/Cluster.cs b/Cluster.cs
index 7c77590..fc8f88f 100644
--- a/Cluster.cs
+++ b/Cluster.cs
@@ -7,38 +7,31 @@ using static Unity.Mathematics.math;
 [System.Serializable]
 public class Cluster : INucleus {
     // The ScriptableObject asset from which the runtime object has been created
-    [SerializeField]
-    public ClusterPrefab prefab;
+    public ClusterPrefab storedPrefab;
+    //public ClusterPrefab prefab;
 
-    public ClusterPrefab cluster { get; set; }
-
-    [SerializeField]
-    protected string _name;
-    public virtual string name {
-        get => _name;
-        set => _name = value;
+    public Cluster() {
+    }
+    public Cluster(Cluster parent) {
+        this.parent = parent;
     }
 
     public Cluster(ClusterPrefab prefab) {
-        this.prefab = UnityEngine.Object.Instantiate(prefab);
+        this.storedPrefab = prefab;
+        //this.prefab = prefab.Clone();
         this.name = prefab.name;
         this.cluster = null;
         if (this.cluster != null)
-            this.cluster.nuclei.Add(this);        
+            this.cluster.nuclei.Add(this);
     }
 
-    // Hmm, a cluster instance can never be part of a scriptable object...(Cluster)
-    public Cluster(ClusterPrefab parent, ClusterPrefab prefab) {
-        this.prefab = prefab.Clone(); //UnityEngine.Object.Instantiate(prefab);
-        this.name = prefab.name;
+    public Cluster(ClusterPrefab parent, ClusterPrefab realPrefab) {
+        this.storedPrefab = realPrefab;
+        //this.prefab = realPrefab.Clone();
+        this.name = realPrefab.name;
         this.cluster = parent;
         if (this.cluster != null)
             this.cluster.nuclei.Add(this);
-
-        // foreach (IReceptor nucleus in this.prefab.nuclei) {
-        //     IReceptor clone = nucleus.CloneTo(null);
-        //     this.dynamicNuclei.Add(clone);
-        // }
     }
 
     public virtual IReceptor Clone() {
@@ -56,7 +49,112 @@ public class Cluster : INucleus {
         return clone;
     }
 
-    public INucleus output => prefab.output;
+    // public IReceptor CloneTo(ClusterPrefab parent) {
+    //     Cluster clone = new(parent, this.prefab);
+    //     return clone;
+    // }
+
+    public IReceptor ShallowCloneTo(Cluster parent) {
+        Cluster clone = new(parent);
+        return clone;
+    }
+
+    // public IReceptor ShallowCloneTo(ClusterPrefab parent) {
+    //     Cluster clone = new(parent, this.prefab);
+    //     return clone;
+    // }
+
+    // Deep clone a nucleus with its connections
+    public virtual Cluster InstantiatePrefab(ClusterPrefab prefab) {
+        Cluster clone = new Cluster {
+            nuclei = new()
+        };
+
+        IReceptor[] nucleiArray = this.nuclei.ToArray();
+        // first clone the nuclei without their connections
+        foreach (IReceptor nucleus in this.nuclei)
+            nucleus.ShallowCloneTo(clone);
+        IReceptor[] clonedNuclei = clone.nuclei.ToArray();
+
+        // Now clone the connections
+        for (int nucleusIx = 0; nucleusIx < nucleiArray.Length; nucleusIx++) {
+            IReceptor receptor = nucleiArray[nucleusIx];
+            IReceptor clonedReceptor = clonedNuclei[nucleusIx];
+            if (clonedReceptor == null)
+                continue;
+
+            // Copy the synapses
+            if (receptor is INucleus nucleus) {
+                foreach (Synapse synapse in nucleus.synapses) {
+                    if (clonedReceptor is not INucleus clonedNucleus)
+                        continue;
+
+                    int ix = GetNucleusIndex(nucleiArray, synapse.nucleus);
+                    if (ix < 0)
+                        continue;
+                    IReceptor clonedSynapseNucleus = clonedNuclei[ix];
+                    if (clonedSynapseNucleus == null)
+                        continue;
+
+                    clonedNucleus.AddSynapse(clonedSynapseNucleus, synapse.weight);
+                }
+            }
+            // Copy the receivers
+            foreach (INucleus receiver in nucleiArray[nucleusIx].receivers) {
+                int ix = GetNucleusIndex(nucleiArray, receiver);
+                if (ix < 0)
+                    continue;
+
+                if (clonedNuclei[ix] is not INucleus clonedReceiver)
+                    continue;
+
+                clonedReceptor.AddReceiver(clonedReceiver);
+            }
+        }
+
+        return clone;
+    }
+
+    private int GetNucleusIndex(IReceptor[] nucleiArray, IReceptor nucleus) {
+        for (int i = 0; i < nucleiArray.Length; i++) {
+            if (nucleus == nucleiArray[i])
+                return i;
+        }
+        return -1;
+    }
+
+    public ClusterPrefab cluster { get; set; }
+    public Cluster parent { get; set; }
+
+    [SerializeReference]
+    public List<IReceptor> nuclei = new();
+
+    [SerializeField]
+    protected string _name;
+    public virtual string name {
+        get => _name;
+        set => _name = value;
+    }
+
+    public List<INucleus> _inputs = null;
+    public virtual List<INucleus> inputs {
+        get {
+            if (this._inputs == null) {
+                this._inputs = new();
+                foreach (IReceptor receptor in this.nuclei) {
+                    if (receptor is INucleus nucleus) {
+                        // inputs have no incoming synapses yet.
+                        if (nucleus.synapses.Count == 0)
+                            this._inputs.Add(nucleus);
+                    }
+                }
+            }
+            return this._inputs;
+        }
+    }
+
+    //public INucleus output => prefab.output;
+    public virtual INucleus output => this.nuclei[0] as INucleus;
 
     // Not sure if this belongs here...
     [SerializeReference]
@@ -68,27 +166,14 @@ public class Cluster : INucleus {
 
     #region Synapses
 
-    // class ClusterSynapse : Synapse {
-    //     public IReceptor receptor;
-    //     public ClusterSynapse(IReceptor nucleus, INucleus receptor, float weight = 1.0f) : base(nucleus, weight) {
-    //         this.receptor = receptor;
-    //     }
-    // }
     [SerializeField]
     private List<Synapse> _synapses = new();
     public List<Synapse> synapses => _synapses;
 
-    public Synapse AddSynapse(IReceptor sendingNucleus) {
-        Synapse synapse = new(sendingNucleus); //, this.prefab.inputs[0]);
+    public Synapse AddSynapse(IReceptor sendingNucleus, float weight = 1.0f) {
+        Synapse synapse = new(sendingNucleus, weight); //, this.prefab.inputs[0]);
         this._synapses.Add(synapse);
         return synapse;
-        // else {
-        //     INucleus receptor = (INucleus)this.prefab.nuclei.Find(nucleus => nucleus is INucleus n && nucleus.name == nucleusName);
-        //     ClusterSynapse synapse = new(sendingNucleus, receptor);
-        //     receptor.AddSynapse(sendingNucleus);
-        // }
-        // // Add synapse to which neuron?
-        // return null;
     }
 
     // Does this even exist already?
@@ -117,48 +202,6 @@ public class Cluster : INucleus {
         receiverNucleus.synapses.RemoveAll(synapse => synapse.nucleus == this);
     }
 
-    // public void AddReceiver(INucleus receivingNucleus) {
-    //     int newLength = this._receivers.Count + 1;
-    //     INucleus[] newReceivers = new INucleus[newLength];
-
-    //     // Copy the existing receivers
-    //     for (int ix = 0; ix < this._receivers.Count; ix++)
-    //         newReceivers[ix] = this._receivers[ix];
-    //     // Add the new receivers
-    //     newReceivers[this._receivers.Count] = receivingNucleus;
-    //     // Replace the receivers with the new receivers
-    //     this._receivers = new(newReceivers);
-
-    //     receivingNucleus.AddSynapse(this);
-    // }
-
-    // public void RemoveReceiver(INucleus receivingNucleus) {
-    //     Debug.Log("Clusterinstance. remote receiver");
-    //     int newLength = this._receivers.Count - 1;
-    //     if (newLength < 0)
-    //         //  Array was empty, so we cannot remove anything
-    //         return;
-
-    //     INucleus[] newReceivers = new INucleus[newLength];
-
-    //     int newIx = 0;
-    //     // Copy all receivers except receivingNucleus
-    //     for (int ix = 0; ix < this._receivers.Count; ix++) {
-    //         if (this._receivers[ix] == receivingNucleus)
-    //             // skip the receiver we want to remote
-    //             continue;
-
-    //         if (newIx >= newLength)
-    //             // We want to copy more elements than expected
-    //             // the receivingNucleus is not found
-    //             // and the original array is returned
-    //             return;
-    //         newReceivers[newIx] = this._receivers[ix];
-    //         newIx++;
-    //     }
-    //     this._receivers = new(newReceivers);
-    // }
-
     #endregion Receivers
 
     #region Runtime
@@ -190,10 +233,10 @@ public class Cluster : INucleus {
         foreach (Synapse synapse in this.synapses) {
             sum += synapse.weight * synapse.nucleus.outputValue;
         }
-        
-        // This does not work because the prefab nucleus does not have a state
-        this.prefab.inputs[0].UpdateState(sum);
-        //this._outputValue = this.output.outputValue;
+
+        //this.prefab.inputs[0].UpdateState(sum);
+        this.inputs[0].UpdateState(sum);
+
         UpdateResult(this.output.outputValue);
     }
 
@@ -208,13 +251,14 @@ public class Cluster : INucleus {
         foreach (INucleus receiver in this.receivers)
             receiver.UpdateState();
     }
-    
+
     public void UpdateNuclei() {
         this.stale++;
-        if (this.stale >  2)
+        if (this.stale > 2)
             _outputValue = Vector3.zero;
 
-        foreach (IReceptor nucleus in this.prefab.nuclei)
+        //foreach (IReceptor nucleus in this.prefab.nuclei)
+        foreach (IReceptor nucleus in this.nuclei)
             nucleus.UpdateNuclei();
     }
 
diff --git a/ClusterPrefab.cs b/ClusterPrefab.cs
index 5786820..1beb6b2 100644
--- a/ClusterPrefab.cs
+++ b/ClusterPrefab.cs
@@ -36,12 +36,67 @@ public class ClusterPrefab : ScriptableObject {
         }
     }
 
+/*
+    // Deep clone a nucleus with its connections
     public virtual ClusterPrefab Clone() {
         ClusterPrefab clone = Instantiate(this);
+        clone.nuclei = new();
+        // foreach (IReceptor nucleus in this.nuclei)
+        //     nucleus.CloneTo(clone);
+
+        IReceptor[] nucleiArray = this.nuclei.ToArray();
+        // first clone the nuclei without their connections
+        foreach (IReceptor nucleus in this.nuclei)
+            nucleus.ShallowCloneTo(clone);
+        IReceptor[] clonedNuclei = clone.nuclei.ToArray();
+
+        // Now clone the connections
+        for (int nucleusIx = 0; nucleusIx < nucleiArray.Length; nucleusIx++) {
+            IReceptor receptor = nucleiArray[nucleusIx];
+            IReceptor clonedReceptor = clonedNuclei[nucleusIx];
+            if (clonedReceptor == null)
+                continue;
+
+            // Copy the synapses
+            if (receptor is INucleus nucleus) {
+                foreach (Synapse synapse in nucleus.synapses) {
+                    if (clonedReceptor is not INucleus clonedNucleus)
+                        continue;
+
+                    int ix = GetNucleusIndex(nucleiArray, synapse.nucleus);
+                    if (ix < 0)
+                        continue;
+                    IReceptor clonedSynapseNucleus = clonedNuclei[ix];
+                    if (clonedSynapseNucleus == null)
+                        continue;
+
+                    clonedNucleus.AddSynapse(clonedSynapseNucleus, synapse.weight);
+                }
+            }
+            // Copy the receivers
+            foreach (INucleus receiver in nucleiArray[nucleusIx].receivers) {
+                int ix = GetNucleusIndex(nucleiArray, receiver);
+                if (ix < 0)
+                    continue;
+
+                if (clonedNuclei[ix] is not INucleus clonedReceiver)
+                    continue;
+
+                clonedReceptor.AddReceiver(clonedReceiver);
+            }
+        }
+
         return clone;
     }
 
-
+    private int GetNucleusIndex(IReceptor[] nucleiArray, IReceptor nucleus) {
+        for (int i = 0; i < nucleiArray.Length; i++) {
+            if (nucleus == nucleiArray[i])
+                return i;
+        }
+        return -1;
+    }
+*/
     // Call this function to ensure that there is at least one nucleus
     // This is an invariant and should be ensured before the nucleus is used
     // because output requires it.
diff --git a/INucleus.cs b/INucleus.cs
index f7272f3..cd4ba50 100644
--- a/INucleus.cs
+++ b/INucleus.cs
@@ -10,7 +10,7 @@ public interface INucleus : IReceptor {
 
     // Senders
     public List<Synapse> synapses { get; }
-    public Synapse AddSynapse(IReceptor sender);
+    public Synapse AddSynapse(IReceptor sender, float weight = 1.0f);
 
     public NucleusArray array { get; set; }
 
@@ -48,6 +48,8 @@ public interface IReceptor {
 
     #endregion dynamic
 
+    //public IReceptor ShallowCloneTo(ClusterPrefab parent);
+    public IReceptor ShallowCloneTo(Cluster parent);
     //public IReceptor CloneTo(ClusterPrefab parent);
     public IReceptor Clone();
 }
diff --git a/Neuron.cs b/Neuron.cs
index 099ceab..26443d0 100644
--- a/Neuron.cs
+++ b/Neuron.cs
@@ -88,6 +88,7 @@ public class Neuron : INucleus {
     #region Runtime state (not serialized)
 
     public ClusterPrefab cluster { get; set; }
+    public Cluster parent { get; set; }
 
     #region Activation
 
@@ -159,12 +160,19 @@ public class Neuron : INucleus {
         this.stale++;
         // this._isSleeping = this.stale > 2;
         // if (isSleeping)
-        if (this.stale >  2)
+        if (this.stale > 2)
             _outputValue = Vector3.zero;
     }
 
     #endregion Runtime state
 
+    public Neuron(Cluster parent, string name) {
+        this.parent = parent;
+        this.name = name;
+        if (this.cluster != null) {
+            this.cluster.nuclei.Add(this);
+        }
+    }
     public Neuron(ClusterPrefab parent, string name) {
         this.cluster = parent;
         this.name = name;
@@ -179,6 +187,28 @@ public class Neuron : INucleus {
     //     this._name = name;
     // }
 
+    // this clone the nucleus without the synapses and receivers
+    public virtual IReceptor ShallowCloneTo(Cluster newParent) {
+        Neuron clone = new(newParent, this.name) {
+            array = this.array,
+            curve = this.curve,
+            curvePreset = this.curvePreset,
+            curveMax = this.curveMax,
+            average = this.average
+        };
+        return clone;
+    }
+    public virtual IReceptor ShallowCloneTo(ClusterPrefab newParent) {
+        Neuron clone = new(newParent, this.name) {
+            array = this.array,
+            curve = this.curve,
+            curvePreset = this.curvePreset,
+            curveMax = this.curveMax,
+            average = this.average
+        };
+        return clone;
+    }
+
     public virtual IReceptor CloneTo(ClusterPrefab parent) {
         Neuron clone = new(parent, this.name) {
             array = this.array,
@@ -187,8 +217,6 @@ public class Neuron : INucleus {
             curveMax = this.curveMax,
             average = this.average
         };
-        // if (clone.cluster != null)
-        //     clone.cluster.nuclei.Add(clone);
 
         foreach (Synapse synapse in this.synapses) {
             Synapse clonedSynapse = clone.AddSynapse(synapse.nucleus);
@@ -254,8 +282,8 @@ public class Neuron : INucleus {
         }
     }
 
-    public Synapse AddSynapse(IReceptor sendingNucleus) {
-        Synapse synapse = new(sendingNucleus);
+    public Synapse AddSynapse(IReceptor sendingNucleus, float weight = 1.0f) {
+        Synapse synapse = new(sendingNucleus, weight);
         this.synapses.Add(synapse);
         return synapse;
     }
diff --git a/Receptor.cs b/Receptor.cs
index 74053dd..8d9c81e 100644
--- a/Receptor.cs
+++ b/Receptor.cs
@@ -1,11 +1,14 @@
+using System;
 using System.Collections.Generic;
 using UnityEngine;
 using Unity.Mathematics;
 using static Unity.Mathematics.math;
 
+[Serializable]
 public class Receptor : IReceptor {
 
-    private Cluster cluster;
+    private ClusterPrefab cluster;
+    private Cluster parent;
 
     [SerializeField]
     protected string _name;
@@ -14,16 +17,21 @@ public class Receptor : IReceptor {
         set => _name = value;
     }
 
-    public Receptor(Cluster cluster) {
+    public Receptor(Cluster parent) {
+        this.parent = parent;
+        if (parent != null)
+            parent.nuclei.Add(this);
+    }
+    public Receptor(ClusterPrefab cluster) {
         this.cluster = cluster;
         if (cluster != null)
-            cluster.prefab.nuclei.Add(this);
+            cluster.nuclei.Add(this);
     }
 
-    public Receptor(Cluster cluster, INucleus nucleus) {
+    public Receptor(ClusterPrefab cluster, INucleus nucleus) {
         this.cluster = cluster;
         if (cluster != null)
-            cluster.prefab.nuclei.Add(this);
+            cluster.nuclei.Add(this);
         this.AddReceiver(nucleus);
     }
 
@@ -31,8 +39,10 @@ public class Receptor : IReceptor {
         if (cluster == null)
             return null;
 
+        //Receptor receptor = new(cluster.prefab);
         Receptor receptor = new(cluster);
-        foreach (INucleus nucleus in cluster.prefab.inputs) {
+        //foreach (INucleus nucleus in cluster.prefab.inputs) {
+        foreach (INucleus nucleus in cluster.inputs) {
             if (nucleus != null && nucleus.name == nucleusName) {
                 // Receptor receptor = new(cluster, nucleus);
                 // return receptor;
@@ -45,7 +55,16 @@ public class Receptor : IReceptor {
             return receptor;
     }
 
-    public virtual IReceptor CloneTo(Cluster parent) {
+    public virtual IReceptor ShallowCloneTo(Cluster parent) {
+        Receptor clone = new(parent);
+        return clone;
+    }
+    public virtual IReceptor ShallowCloneTo(ClusterPrefab parent) {
+        Receptor clone = new(parent);
+        return clone;
+    }
+
+    public virtual IReceptor CloneTo(ClusterPrefab parent) {
         Receptor clone = new(parent);
 
         foreach (INucleus receiver in this.receivers) {
diff --git a/Velocity.asset b/Velocity.asset
index 1528d43..aad36ea 100644
--- a/Velocity.asset
+++ b/Velocity.asset
@@ -13,18 +13,18 @@ MonoBehaviour:
   m_Name: Velocity
   m_EditorClassIdentifier: Assembly-CSharp::ClusterPrefab
   nuclei:
-  - rid: 2243601420268863545
+  - rid: 2243601425629446539
   references:
     version: 2
     RefIds:
-    - rid: 2243601420268863545
+    - rid: 2243601425629446539
       type: {class: Neuron, ns: , asm: Assembly-CSharp}
       data:
         _name: Output
         _synapses: []
         _receivers: []
         _array:
-          rid: 2243601420268863546
+          rid: 2243601425629446540
         _curvePreset: 0
         curve:
           serializedVersion: 2
@@ -52,9 +52,9 @@ MonoBehaviour:
           m_RotationOrder: 4
         curveMax: 1
         average: 0
-    - rid: 2243601420268863546
+    - rid: 2243601425629446540
       type: {class: NucleusArray, ns: , asm: Assembly-CSharp}
       data:
         _nuclei:
-        - rid: 2243601420268863545
+        - rid: 2243601425629446539
         name: Output
diff --git a/VisualEditor/Editor/ClusterInspector.cs b/VisualEditor/Editor/ClusterInspector.cs
index 413b87f..6e2022a 100644
--- a/VisualEditor/Editor/ClusterInspector.cs
+++ b/VisualEditor/Editor/ClusterInspector.cs
@@ -620,19 +620,16 @@ public class ClusterInspector : Editor {
             ClusterPickerWindow.ShowPicker(brain => OnClusterPicked(nucleus, brain), "Select Cluster");
         }
 
-        private void OnClusterPicked(INucleus nucleus, ClusterPrefab subCluster) {
-            Cluster subclusterInstance = new(this.cluster, subCluster);
-            //this.cluster.AddSubCluster(subclusterInstance);
-            //this.cluster.nuclei.Add(subclusterInstance);
+        private void OnClusterPicked(INucleus nucleus, ClusterPrefab prefab) {
+            Cluster subclusterInstance = new(this.cluster, prefab);
             subclusterInstance.AddReceiver(nucleus);
         }
 
         private void EditCluster(Cluster subCluster) {
-            //var currentActiveObject = Selection.activeObject;
-            Selection.activeObject = subCluster.prefab;
-            EditorGUIUtility.PingObject(subCluster.prefab);
-            var editor = Editor.CreateEditor(subCluster.prefab);
-            //Selection.activeObject = currentActiveObject;
+            // May be used with storedPrefab...
+            Selection.activeObject = subCluster.storedPrefab;
+            EditorGUIUtility.PingObject(subCluster.storedPrefab);
+            var editor = Editor.CreateEditor(subCluster.storedPrefab);
         }
 
         // Connect to another nucleus in the same cluster
diff --git a/VisualEditor/Editor/NanoBrainComponent_Editor.cs b/VisualEditor/Editor/NanoBrainComponent_Editor.cs
index 6e60376..8b15fe6 100644
--- a/VisualEditor/Editor/NanoBrainComponent_Editor.cs
+++ b/VisualEditor/Editor/NanoBrainComponent_Editor.cs
@@ -22,8 +22,8 @@ public class NanoBrainComponent_Editor : Editor {
     }
 
     public override VisualElement CreateInspectorGUI() {
-        //NanoBrainComponent component = target as NanoBrainComponent;
-        ClusterPrefab brain = Application.isPlaying ? component.brain.prefab : component.defaultBrain;
+        //ClusterPrefab brain = Application.isPlaying ? component.brain.prefab : component.defaultBrain;
+        Cluster brain = component.brain;
 
         if (Application.isPlaying == false)
             serializedObject.Update();
@@ -79,7 +79,7 @@ public class NanoBrainComponent_Editor : Editor {
         });
 
         if (brain != null && board != null)
-            board.SetGraph(component.gameObject, brain, brain.output, inspectorContainer);
+            board.SetGraph(component.gameObject, brain.storedPrefab, brain.output, inspectorContainer);
         // else
         //     Debug.LogWarning(" No brain!");
 
diff --git a/VisualEditor/NanoBrainComponent.cs b/VisualEditor/NanoBrainComponent.cs
index d5b39c9..5ed427f 100644
--- a/VisualEditor/NanoBrainComponent.cs
+++ b/VisualEditor/NanoBrainComponent.cs
@@ -1,6 +1,7 @@
 using UnityEngine;
 
 public class NanoBrainComponent : MonoBehaviour {
+    [SerializeField]
     public ClusterPrefab defaultBrain;
     private Cluster brainInstance;