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RT @TristanRutland7: 7/ They arise from the ectoderm +probably arise from the same stem cell as the epithelial cells. 8/ In breast (+proba…
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7/ They arise from the ectoderm +probably arise from the same stem cell as the epithelial cells. 8/ In breast (+probably other sites, because the body uses the same template during embryogenesis), they may have a paracrine role (release hormones locally).