has part has part has_part characteristic of has modifier abnormal nipple morphology decreased nipple number fewer than the expected number of structures located on the apex of the mammary gland on the integument surface into which the lactiferous ducts open; normal female mice have five pairs of mammary glands and nipples (males have no nipples); two pairs of nipples are situated in the abdomino-inguinal region (inguinal group) and three pairs in the ventral thoracic region (pectoral or thoracic group) reduced nipple number decreased papilla mammae number reduced papilla mammae number MP:0013529 decreased thele mammae number Variation in number and arrangement of nipples is frequent on some mouse strains. For examples, fewer than five pairs are common in strain A females; more than five pairs in BALB/c females (Little, C.C., and H. MacDonald. 1945. Abnormalities of the mammae in the house mouse. J. Hered. 36: 285-288.) decreased teat number decreased thelium mammae number reduced thelium number reduced teat number reduced thele number abnormal decreased amount nipple