Progesterone receptor function is required for mammary ductal side-branching and alveologenesis

<p><b>Copyright information:</b></p><p>Taken from "Progesterone receptors - animal models and cell signaling in breast cancer: Progesterone's role in mammary gland development and tumorigenesis as disclosed by experimental mouse genetics"</p><p>Breast Cancer Research 2002;4(5):191-196.</p><p>Published online 5 Jul 2002</p><p>PMCID:PMC138743.</p><p>Copyright © 2002 BioMed Central Ltd</p> The salient postnatal stages of mammary gland development. Whole mounts of transplanted progesterone receptor knockout (PRKO) mammary glands and wild-type mammary glands taken from a nulliparous host, and transplanted PRKO mammary glands and wild-type mammary glands taken from a parous host. Scale bar in (b) denotes 500 m and applies to all whole mounts. Adapted from Lydon . []