Sca-1-, CD24-and Muc1-positive cells may represent mammary gland progenitor cells, mammary gland stem cells, and mammary gland mature epithelium cells, respectively.

• Sca-1阳性细胞可能代表一类乳腺祖细胞,CD24阳性细胞代表一类乳腺干细胞,而Muc1阳性细胞代表成熟腺上皮细胞。