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Effect of other steroids on PR1 cell proliferation and PRL secretion. E2, estriol (E3), 17α-estradiol (17a-E2), cortisol (CO), testosterone (TE), and progesterone (PR) activities were measured at 0.001 nM for (A) cell proliferation induction (mean ± SD of quadruplicate samples) and (B) PRL secretion.
