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CK14, CK18, and prolactin expression in bovine mammary gland. (A) Biopsied bovine mammary gland tissues stained with hematoxylin and eosin revealed a ductal structure. Immunostaining for CK14 (B), CK18 (C), and prolactin (D) showed strong positive expression of all three in the mammary gland duct. Bar=50 μm and 100 μm.
