Fig. 6.
Presynaptic performance is stabilized after heat pretreatment, but this neuroprotection diminishes with increased recovery time when hsp70 levels are decreased. EJC parameters were assessed in control (C, open circles) and heat shock (HS1/2, 1/2 hr recovery,filled circles; HS6, 6 hr recovery, filled squares) experiments at the four test temperatures. Significant differences between C andHS1/2 at each test temperature assessed using a t test are denoted with anasterisk. a, EJC amplitude.b, Normalized EJC amplitude. Amplitudes at 27, 31, and 35°C were normalized to that at 22°C in each experiment.c, The percentage of transmission failures.d, The estimated mean quantal content. Error bars represent SEs.