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Histological section of teat and mammary tissue of 7-day postnatal gilt. (A) Teat and mammary tissue were excised from 7-day postnatal gilts, and images were captured at 200×. (B,C) Illustrate the selection of the mammary parenchymal area (red outline) and mammary epithelium (green outline) within this region for calculation of parenchymal epithelial area (PEA).
