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Apoptosis of wild-type and mutant mammary glands. Apoptotic cells of mammary glands from 8-week-old virgin and pregnant (15 days) females were visualized by immunohistochemistry using an anti-cleaved caspase 3 polyclonal antibody. The incidences of apoptotic cells in wild-type and (singly and double heterozygous) mutant mammary glands are comparable. Scale bar, 100 μm.
