Animals 38 Mammary Glands, Animal Female 34 Mice 34 article 32 nonhuman 32 mouse 30 controlled study 28 priority journal 26 animal cell 22 female 20 protein expression 20 breast epithelium 18 signal transduction 18 Epithelial Cells 16 Lactation 16 Mice, Inbred BALB C 16 animal 16 human 16 udder 16 Cell Differentiation 14 animal experiment 14 gene expression 14 metabolism 14 Humans 12 Pregnancy 12 RNA, Messenger 12 apoptosis 12 cytology 12 epithelium cell 12