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. 2022 May 18;10:884467. doi: 10.3389/fcell.2022.884467

FIGURE 3.

FIGURE 3

The developing mammary gland and Wnt signaling activity. (A) The first morphogenic event in murine mammary gland embryonic development is the specification of the mammary lines along the anterior-posterior axis of each flank around embryonic day 10.5. On embryonic day 11.5, five pairs of placodes composed of condensed mammary epithelial cells arise from the mammary line. These primordial structures undergo a series of morphological changes until a rudimentary mammary ductal tree is formed at E18.5. (B) TOPGAL Wnt reporter expression during embryonic mammary gland development (Wnt active areas in red) (Chu et al., 2004). (C) TOP lacZ Wnt reporter expression during embryonic mammary gland development (Wnt active areas in red) (Boras-Granic et al., 2006; Boras-Granic and Wysolmerski, 2008).