diff --git a/neuron/soma.md b/neuron/soma.md
index 3f1af50..99633c6 100644
--- a/neuron/soma.md
+++ b/neuron/soma.md
@@ -11,37 +11,51 @@ Qui comprendiamo:
 
 ---
 
-**Simplified behaviors**:
+**Simplified verifiable behaviors**:
 
 — ms:
 
 - Resting at -70 mV: Leak channels + pumps (keep at resting)
--- ?
 - VDB Depolarization : ~1-2 ms: Na⁺ enters (some VGSCs open)
-- Opened VGSC remain closed for a refractory period
- Spike if depolarized above threshold: to -50 mV
- -- Here the threshold is based only on the integration of Na+
- -- The threshold is tuned during the spiketrain. Low threshold at rest, to increase sensitivity, threshold increase during spike to increase discrimination
- -- increase SpikeTrainTraces (fast at spike)
- -- increase Ca2+ traces
+- Opened VGSC and then remain closed for a refractory period
+- Spike if depolarized above threshold: to -50 mV
+- Ca2+ enter
 - Repolarization to -70 mV:  ~1-2 ms: K⁺ exits (VG K⁺ channels open) ← NOT pumps!
--- fast pump which decreases Na+, we do not model K+
 - After-hyperpolarization: ~5-20 ms: K⁺ channels still open
--- must figure out how to deal with deoplarization
--- decrease SpikeTraintraces slow, only if away from spiketrain this is empty
 
-— seconds:
+— secs:
 
 - Return to exact -70 mV: ~100-1000 ms: Na⁺/K⁺ pumps restore gradients
--- slow pump
-- Ca2+ accumulation: SpikeTrainTraces
--- ?
+- Ca2+ accumulation
+
 — mins:
 
 - VGSC modulation
 
 ---
 
+**G expression**:
+
+— ms:
+
+- Here the threshold is based only on the integration of Na+
+- The threshold is tuned during the spiketrain. Low threshold at rest, to increase sensitivity, threshold increase during spike to increase discrimination
+- increase SpikeTrainTraces (fast at spike)
+- increase Ca2+ traces
+
+- fast pump which decreases Na+, we do not model K+
+
+- must figure out how to deal with deoplarization
+- decrease SpikeTraintraces slow, only if away from spiketrain this is empty
+
+— secs:
+
+- SpikeTrainTraces
+
+— mins:
+
+---
+
 **Tubs:**
 
 - **VDB**: dendrites deliver current