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Effects of acute and chronic cold stress on the Hsp90, Hsp70, and Hsp60 protein expression in heart of chickens. a, b Acute and chronic cold stress groups, respectively. Acute cold stress groups (1, 3, 6, 12, and 24 h), 0 h = acute cold stress control group, chronic cold stress groups (5s, 10s, and 20s), and chronic corresponding control groups (5c, 10c, and 20c)
