diff --git a/elements/neuron/soma.md b/elements/neuron/soma.md
index 9578ee9..b1b8ece 100644
--- a/elements/neuron/soma.md
+++ b/elements/neuron/soma.md
@@ -14,14 +14,16 @@ Expansions and modulations:
 SOMA
   type: comprehension
 
-  expand_comprehension: 
-    &SOMA_VGSC-H: SOMA_VGSC (full: 50x, active: 20x, empty: 10x) 
-    &SOMA_VGSC-M: SOMA_VGSC (full: 50x, active: 20x, empty: 10x) 
-    &SOMA_VGSC_L: SOMA_VGSC (full: 50x, active: 20x, empty: 10x) 
+  expansion: 
+    _@SOMA_VGSC-H: TUB [ comprehension: SOMA_VGSC, full: 50x, active: 20x, empty: 10x ] 
+    _@SOMA_VGSC-M: TUB [ comprehension: SOMA_VGSC, full: 50x, active: 20x, empty: 10x ] 
+    _@SOMA_VGSC-L: TUB [ comprehension: SOMA_VGSC, full: 50x, active: 20x, empty: 10x ] 
 
-  instantiate_container:
-    MAIN-SOMA []
-    SOMA_VGSC_H_TUN [pass: &SOMA_VGSC_H]
+  instantiation:
+
+    # Behaviour
+    $: BEHAVIOUR [ behaviour: MAIN-SOMA ]
+    $: BEHAVIOUR [ behaviour: SOMA_VGSC_H_TUN ]
     SOMA_VGSC_M_TUN [pass: &SOMA_VGSC_M]
     SOMA_VGSC_L_TUN [pass: &SOMA_VGSC_L]