Fig. 5. The soma of RPeD1 is required for memory formation with the KCl bath training procedure. Snails (N=22) that had the soma of RPeD1 ablated 2 days before training were placed in a 25 mmoll^–1 KCl bath and then trained for 30 min (TS). A day later (MT) the number of attempted pneumostome was statistically the same as in TS. Thus LTM was not formed. On the other hand, snails (N=14) that had the soma of VD1 ablated 2 days prior to training did have memory at 24 h (^**P<0.01).