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A, Histogram representing the percentage of cells stained positive for PR in the epithelial compartment of mammary glands of 30-d-old mice treated perinatally with vehicle, 25 and 250 ng BPA/kg bw·d (**, P < 0.01; *, P < 0.05) (bars indicate mean ± sem). B, Photomicrograph showing clusters (as indicated by the arrow) of PR-expressing cells in the mammary gland ducts of BPA-treated mice.
