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Transmission electron microscopy of synaptic ultrastructure. (A–E) Representative images of synaptic ultrastructure from hippocampus of different groups. (F) Summary data of synaptic numbers in the hippocampus of elderly rat offspring. Arrows indicate the number of synapses (A–E). Data are expressed as mean ± SEM, n = 4 per group, *p < 0.05, PL + SE group vs. control group; +p < 0.05, PL + SE group vs. PS + SE group; **p < 0.05, PL + EE group vs. PL + SE group.
