diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index 578330c..1de3be1 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -5,13 +5,14 @@ include_toc: true
 // presynapse.md
 
 
-Expansions and modulations:
+**Expansions and modulations**:
   - is expanded and developed by: [AXON](axon.md)
   - is tuned by: [ORGANISM](../../organism.md), organs, modules
   - expands and tunes: [PRE_VGG](pre_vgcc.md)
   - develops _Ca2, _Rrp
 
-  Introduction: 
+  **Introduction**:
+  
   The presynaptic bouton releases neurotransmitter and gathers evidence about whether that release was worth strengthening and worth sustaining. Its behavior unfolds across two DAY contexts and the NIGHT scope.
 
   During DAY, during AP — the bouton releases neurotransmitter. The amount released depends on: