Synaptic transmission was assessed during and immediately after sustained stimulation in autaptic excitatory munc18-1 neurons expressing M18WT or M18Y473D.(B) EPSC charge during 100 pulses at 40 Hz. Top: example traces of the current evoked by 40Hz stimulation. Insert shows total charge transferred during entire train (M18WT: 2.63 ± 0.38 nC; M18Y473D: 1.48 ± 0.24 nC, t test with Welch correction, p = 0.0177). 