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Experimental schedule. Experiment 1: conditioned foot shock (CF) sessions were continued for 5 d, and SPS occurred on the 6th d. The behavioral tests were conducted on the corresponding days. Experiment 2: the procedures for establishing the model were identical to those of Experiment 1. Flow cytometry (FCM), terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL), Western blotting (UB), and qPCR were performed on the 14th d.
