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The uterine tube weight and plasma estrogen concentration are positively correlated. A: the uterine tube weight from rats in proestrus (n=12) is significantly greater than rats in metestrus/diestrus (n=12). B: Rats in proestrus (n=6) had significantly greater plasma estrogen concentration than rats in metestrus/diestrus (n=12). C: the uterine tube weight is positively correlated with plasma estrogen level. # t-test p<0.001 compared with met/di. * linear regression p<0.05.
