ICa(Ba)expression in a first instar larval dbd neuron. A) Whole cell voltage clamp recording from dbd neuron. B) Voltage step protocol for traces. Currents are evoked from voltage steps between -80 mV to +60 mV in increments of 10 mV. For clarity, 20 mV increments are shown in (A, B). The voltage step protocol is preceded by a -90 mV pre-pulse to remove any inactivating components. C) Normalised I-V relationship of ICa(Ba)the channels activate between -50 and -40 mV and peak between 5 and 15 mV. Data plotted as mean ± SEM. External solution contains 4-AP (10 mM), TEA (50 mM), and TTX (1 μM). Ba2+ is substituted for Ca2+. Internal solution contains cesium (5 mM).