Fig. 6.

Synaptic function of NMJ4 does not correlate with morphology. Intracellular recordings of miniature evoked excitatory junction potential (mEJP) amplitude and frequency and evoked excitatory junction potentials (EJPs) are from muscle 4 in 0.4 mM external calcium. (A) Representative mEJP recordings, quantified in C and D. Scale: 2 mv; 200 ms. (B) Representative EJPs evoked by electrical stimulation of the appropriate segmental nerve bundle. Scale: 5 mv; 200 ms. (E) Average EJP amplitude, a measure of the number of vesicles released in response to an evoked action potential, is quantified for each species. Error bars indicate SEM (minimum n = 12). mel, melanogaster; pun, punjabiensis; fun, funebris; vir, virilis.