Figure 4.
Amplitude and decay time course of miniature end plate currents. Records of representative mEPCs from wild-type (Left) and AChRɛ−/− mutant mouse muscle (Right). All records at −70 mV, 20–21°C. Inward current is downward. Sampling at 15 kHz. Scale bars in C refer to all traces. (A) P5 muscles. Peak mEPC amplitude is 3.2 nA and decay time constant is 4.6 ms for wild-type and 3.2 nA and 4.7 ms for AChRɛ−/− end plate. (B) P30 muscles: 3.3 nA and 1.0 ms for wild-type and 2.3 nA and 4.2 ms for AChRɛ−/− end plate. (C) P70 muscles: 3.3 nA and 1.0 ms for wild-type and 1.0 nA and 4.2 ms for AChRɛ−/− end plate.