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Mammary gland development in BALB/c and C57BL/6 mice. Mammary gland whole mounts were prepared from 6-wk-old immature, 20-wk-old adult, and 10 and 14 d pregnant (preg) BALB/c and C57BL/6 mice as described in Materials and Methods. Lower magnification images with higher magnification insets are shown for adult and pregnant mammary glands. Black arrowheads indicate sidebranching in the adult BALB/c mouse. Scale bar, 1 mm.
