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Plateau potential induced in B31/B32 by DC injection is blocked by PIR. Depolarizing current of 10 or 20 nA was injected for 5 sec into B31/B32 (I) and its voltage response (V) was recorded in normal saline (ASW), in 1 × 10–3 m pirenzepine (PIR), and after normal saline wash (WASH). In PIR, there was no plateau potential in B31/B32 even when twice the amount of current sufficient to elicit a plateau potential in normal saline was injected.
