Ca2+ current (IC
a) recordings illustrating the effects of H89 and KN‐93 on PPN cells. All IC
a were recorded using a multiple step depolarization protocol starting at −50 mV with 10 mV steps, up to 0 mV (top), but this figure shows only the −10 mV step. (A) IC
a recorded from a PPN neuron (probably N + P/Q‐type) before (navy), after 10 min of H89 (red record, reduction), and 10 min of CgTx (green, block). (B) IC
a from a PPN neuron (probably P/Q‐type) before (navy record), after 10 min of H89 (red, no effect), and 10 min of Aga (green record, block). (C) IC
a recorded from a PPN neuron (probably N‐type) before (navy), after 10 min of H89 (red, block), and 20 min of H89 (green, block). (D) IC
a recorded from a PPN neuron (probably N + P/Q‐type) before (navy record), after 10 min of KN‐93 (red, reduction), and 10 min of CgTx (green, block). (E) IC
a from a PPN neuron (probably N‐type) before (navy), after 10 min of KN‐93 (red record, no effect), and 10 min of CgTx (green, block). (F) IC
a recorded from a PPN neuron (probably P/Q‐type) before (navy), after 10 min of KN‐93 (red record, block), and 20 min of KN‐93 (green, block).