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Initial latency and step-through latency after 1 day to enter the dark room of the passive avoidance apparatus before and after the foot shock (within groups) (n = 8). Results are expressed as means ± standard error of mean (paired sample t-test). +P < 0.05, ++P < 0.01 and +++P < 0.001 initial latency relative to the step-through latency. Co: Control group, Sh: Sham group, St.R: Restrain stress group, St.R-C30: Restrain stress-Crocin 30 group, St.R-C60: Restrain stress-Crocin 60 group
