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Rat mammary glands contain a subpopulation of clonogenic epithelial cells with large proliferation and differentiation potentials. When transplanted, the clonogens in monodispersed rat mammary epithelial cell suspensions give rise to either alveolar units (AUs) or ductal units (DUs) depending on the nature of the hormonal milieu in the graft recipient. Clonogens are also the primary cells of origin...
Squamous metaplasia (SQM) developed in cultures of rat mammary organoids in reconstituted basement membrane, Matrigel, under either a complete hormone medium (CHM) or a serum-free mammary epithelium growth medium (MEGM). Organoids cultured in CHM gave rise to fewer such SQM (∼5%) than those in MEGM (∼16%). Formation of SQM was completely suppressed when retinoids were added to CHM. However, a few...
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