Table 1.

Effects of E2 and PP2 on baseline responses and LTP amplitude measured 30 min after tetanus

Treatment (no.)	Baseline response, %	LTP amplitude, %
Control (10)	101  ± 1	163  ± 3
E2 (10)	150  ± 2*	204  ± 5*
PP2 (6)	107  ± 2	184  ± 7
PP2 + E2 (7)	115  ± 3†	172  ± 4†

See legend to Fig. 5. Results for the baseline response represent the amplitude of EPSPs before high frequency stimulation and are expressed as percentage of the predrug levels. LTP amplitudes represent the amplitudes of EPSPs measured 30 min after high frequency stimulation and are expressed as percentage of the average values measured immediately before high frequency stimulation. Data are means ± SEM of the indicated number of experiments. *, P < 0.05 compared with the respective control values. †, P < 0.05 when compared to E2 alone but not significant from control (Student's t test).