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Changes in mammary gland architecture induced by estrogen and progesterone. Tissues from mice that were nulliparous (a, d), E+P-treated (b, e), and parous (c, f) were examined using whole mounts (a-c) and 4-μm sections stained with hematoxylin and eosin (d-f). Magnifications, × 4 (a-c) and × 100 (d-f). E+P, estrogen and progesterone.
