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Female rats are better in social cooperation than males (a) and also showing higher level of activity (b). However, no significant differences were found in efficacy index (c) and latency to the initial A-to-C mutual transition (d). Error bars are SEM; n = 10 pairs of rats in each group (#P < 0.05; ##P < 0.025; *P < 0.001; **P < 0.0001).
