diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index a5dbf09..ec6f7fe 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -17,7 +17,7 @@ PRESYNAPSE
 
   expansion:
 
-    _Vgcc_pre: TUB [ comprehension: VGCC_PRE, full: 10x, active: 5x, empty: 2x ]
+    _@Vgcc_pre: TUB [ comprehension: VGCC_PRE, full: 10x, active: 5x, empty: 2x ]
     # il tub serve al tuning
 
   intrication:
@@ -53,9 +53,9 @@ PRESYNAPSE
     # serve al dev
 
     # Behaviour
-    @: BEHAVIOUR [ behaviour: MAIN_PRE ]
-    @: BEHAVIOUR [ behaviour: TUNE_VGCC_PRE ]
-    @: BEHAVIOUR [ behaviour: DEV-TUBS_PRE ] # da eliminare neuron-dev.md
+    $: BEHAVIOUR [ behaviour: MAIN_PRE ]
+    $: BEHAVIOUR [ behaviour: TUNE_VGCC_PRE ]
+    $: BEHAVIOUR [ behaviour: DEV-TUBS_PRE ] # da eliminare neuron-dev.md
 ```
 
 ### MAIN_PRE