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Representative images of the rat PFC synaptic ultrastructures among the groups by TEM (magnification, ×40,000). (A) CON group; (B) Hypo group; (C) DON group; (D) T4 group; (E) T4 + DON group. PFC, prefrontal cortex; TEM, transmission electron microscope; CON, control; Hypo, hypothyroid; DON, donepezil; T4, thyroxine.
