Figure 9. An example of junction potentials recorded in the same cell in the presence of atropine, guanethidine and SP, as induced by either oral (panel i) or aboral (panel ii) NS.

A, junction potentials produced by oral nerve stimulation in control (a), and after cumulative application of apamin (b), l-NAME (c) and suramin (d). B, overlay of junction potentials corresponding to panel A. Note that the purinergic EJP is polarized, whereas the NANC IJP is not.