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LGR-7 expression in the nipples of pregnant LGR-7 females on day 18.5 of gestation. (a) Wild-type female; (b) LGR7+/− female. In the pregnant LGR7+/− female (panel b), strong positive LacZ staining at the base of the nipple (closed arrows) is shown; some staining was also found in single cells just below the epithelium (open arrows). (c) Detail of panel b.
