diff --git a/Cluster.cs b/Cluster.cs
index a2bc161..315d2f8 100644
--- a/Cluster.cs
+++ b/Cluster.cs
@@ -38,39 +38,45 @@ public class Cluster : Nucleus {
     private void ClonePrefab() {
         Nucleus[] prefabNuclei = this.prefab.nuclei.ToArray();
         // first clone the nuclei without their connections
-        foreach (Nucleus nucleus in this.prefab.nuclei)
+        foreach (Nucleus nucleus in this.prefab.nuclei) {
+            Debug.Log($"prefab clone {nucleus.name}");
             nucleus.ShallowCloneTo(this);
+        }
+        Debug.Log(" complete");
         Nucleus[] clonedNuclei = this.clusterNuclei.ToArray();
 
         // Now clone the connections
         for (int nucleusIx = 0; nucleusIx < prefabNuclei.Length; nucleusIx++) {
             Nucleus prefabNucleus = prefabNuclei[nucleusIx];
-            Nucleus clonedReceptor = clonedNuclei[nucleusIx];
-            if (clonedReceptor == null)
+            if (prefabNucleus is not Neuron prefabNeuron)
+                continue;
+
+            Nucleus clonedNucleus = clonedNuclei[nucleusIx];
+            if (clonedNucleus == null || clonedNucleus is not Neuron clonedNeuron)
                 continue;
 
             // Copy the receivers, which will also create the synapses
             // Clusters do not have receivers...
-            // foreach (Nucleus receiver in prefabNucleus.receivers) {
-            //     int ix = GetNucleusIndex(prefabNuclei, receiver);
-            //     if (ix < 0)
-            //         continue;
+            foreach (Nucleus receiver in prefabNeuron.receivers) {
+                int ix = GetNucleusIndex(prefabNuclei, receiver);
+                if (ix < 0)
+                    continue;
 
-            //     if (clonedNuclei[ix] is not Nucleus clonedReceiver)
-            //         continue;
+                if (clonedNuclei[ix] is not Nucleus clonedReceiver)
+                    continue;
 
-            //     // Find the synapse for the weight
-            //     float weight = 1;
-            //     foreach (Synapse synapse in receiver.synapses) {
-            //         // Find the weight for this synapse
-            //         if (synapse.nucleus == prefabNucleus) {
-            //             weight = synapse.weight;
-            //             break;
-            //         }
-            //     }
+                // Find the synapse for the weight
+                float weight = 1;
+                foreach (Synapse synapse in receiver.synapses) {
+                    // Find the weight for this synapse
+                    if (synapse.nucleus == prefabNucleus) {
+                        weight = synapse.weight;
+                        break;
+                    }
+                }
 
-            //     clonedReceptor.AddReceiver(clonedReceiver, weight);
-            // }
+                clonedNeuron.AddReceiver(clonedReceiver, weight);
+            }
         }
 
         // Copy nucleus arrays
@@ -180,9 +186,50 @@ public class Cluster : Nucleus {
             name = this.name,
             clusterPrefab = this.clusterPrefab,
         };
+        // This cloned the prefab with the clusternuclei,
+        // but did not clone the receivers outside the cluster
+        RestoreExternalReceivers(clone, this.clusterPrefab, parent);
+
         return clone;
     }
 
+    protected void RestoreExternalReceivers(Cluster clone, ClusterPrefab prefabParent, Cluster clonedParent) {
+        for (int nucleusIx = 0; nucleusIx < this.clusterNuclei.Count; nucleusIx++) {
+            Nucleus prefabNucleus = this.clusterNuclei[nucleusIx];
+            if (prefabNucleus is not Neuron prefabNeuron)
+                continue;
+
+            Nucleus clonedNucleus = clone.clusterNuclei[nucleusIx];
+            if (clonedNucleus == null || clonedNucleus is not Neuron clonedNeuron)
+                continue;
+
+            // Copy the receivers, which will also create the synapses
+            foreach (Nucleus receiver in prefabNeuron.receivers) {
+                int ix = GetNucleusIndex(prefabParent.nuclei, receiver);
+                if (ix < 0)
+                    continue;
+
+                //if (clone.clusterNuclei[ix] is not Nucleus clonedReceiver)
+                if (clonedParent.clusterNuclei[ix] is not Nucleus clonedReceiver)
+                    continue;
+
+                // Find the synapse for the weight
+                float weight = 1;
+                foreach (Synapse synapse in receiver.synapses) {
+                    // Find the weight for this synapse
+                    if (synapse.nucleus == prefabNucleus) {
+                        weight = synapse.weight;
+                        break;
+                    }
+                }
+
+                clonedNeuron.AddReceiver(clonedReceiver, weight);
+            }
+        }
+
+        
+    }
+
     protected int GetNucleusIndex(Nucleus[] nuclei, Nucleus nucleus) {
         for (int i = 0; i < nuclei.Length; i++) {
             if (nucleus == nuclei[i])
diff --git a/ClusterPrefab.cs b/ClusterPrefab.cs
index ada3553..90db0db 100644
--- a/ClusterPrefab.cs
+++ b/ClusterPrefab.cs
@@ -114,4 +114,4 @@ public class ClusterPrefab : ScriptableObject {
         }
         return -1;
     }
-}
\ No newline at end of file
+}
diff --git a/ClusterReceptor.cs b/ClusterReceptor.cs
index 8e13779..8b409bc 100644
--- a/ClusterReceptor.cs
+++ b/ClusterReceptor.cs
@@ -20,6 +20,11 @@ public class ClusterReceptor : Cluster, IReceptor {
             clusterPrefab = this.clusterPrefab,
             array = this.array
         };
+
+        // This cloned the prefab with the clusternuclei,
+        // but did not clone the receivers outside the cluster
+        RestoreExternalReceivers(clone, this.clusterPrefab, parent);
+
         return clone;
     }
 
@@ -44,7 +49,7 @@ public class ClusterReceptor : Cluster, IReceptor {
                 continue;
 
             foreach (Nucleus receiver in output.receivers)
-                clonedOutput.AddReceiver(receiver);            
+                clonedOutput.AddReceiver(receiver);
         }
         return clone;
     }
diff --git a/Editor/NanoBrain_Editor.cs b/Editor/NanoBrain_Editor.cs
index 376e9f0..4dcb4c5 100644
--- a/Editor/NanoBrain_Editor.cs
+++ b/Editor/NanoBrain_Editor.cs
@@ -36,7 +36,8 @@ public class NanoBrainComponent_Editor : Editor {
             root.Add(brainField);
         }
 
-        ClusterInspector.CreateInspector(root, brain.prefab, brain.defaultOutput, component.gameObject);
+        if (brain != null)
+            ClusterInspector.CreateInspector(root, brain.prefab, brain.defaultOutput, component.gameObject);
 
         if (Application.isPlaying == false)
             serializedObject.ApplyModifiedProperties();