Fig. 4.

Linearization of I–V curves for CabTRP, TNRNFLRFamide, pilocarpine, and CCAP in low external Ca²⁺. Control I–V curves were obtained in normal external Ca²⁺ (13 mm). Low-calcium saline contained 0.1 mmCa²⁺. Curves for CabTRP, TNRNFLRFamide and pilocarpine were obtained from SEVC recordings of cultured neurons. The CCAP curve was obtained from a TEVC recording of the LP neuron (semi-intact preparation) in the presence of 10 μm PTX and 0.1 μm TTX. In each individual graph, control and low-Ca²⁺ responses are from the same neuron. Each graph, however, shows results from a separate neuron. CabTRP (10⁻⁶m), TNRNFLRFamide (10⁻⁶m), and pilocarpine (3 × 10⁻⁵m) were bath-applied. CCAP (10⁻⁴m) was pressure-applied to the ganglion neuropil.