Fig. 3. Effects of Cancer borealis tachykinin-related peptide Ia (CabTRP Ia) on the isolated cardiac ganglion (CG). (A) Intra-axonal recording from a motor neuron during control (top trace) and in the presence of 10^–6 mol l^–1 CabTRP Ia (bottom trace). (B) Superimposed intra-axonal recordings from the same traces in A during control (gray) and after the application of CabTRP Ia (black). CabTRP Ia induced a 2 mV depolarization. (C) Scatter plots of the instantaneous burst frequency (left plot) and number of spikes per burst (right plot) versus time during control, CabTRP Ia (gray bar) and during wash. (D) Bar plots of the pooled data comparing control (C) versus CabTRP Ia for the different parameters measured (Student's t-test; N=12; ^*P<0.05; ^**P<0.01).