Oxotremorine (OXO) restores the ability of DC injection to induce a plateau potential in B31/B32 in the presence of a high divalent cation solution (HiDi) and tetrodotoxin (TTX). A depolarizing current of 20 nA was injected for 5 sec into B31/B32, while recording from neuron B4/5 to monitor retraction phase, in normal saline (ASW), HiDi, HiDi with 10–5
m OXO, and HiDi with 3.3 × 10–5
m TTX and 10–5
m OXO.