has subject area Animal Population Groups - Mice, Knockout Animals Epithelium - Epidermis Epithelium - Hair Follicle Gene Expression Regulation, Developmental Hair - Hair Follicle Mice Mice - Mice, Knockout Mice, Mutant Strains - Mice, Knockout Morphogenesis Morphogenesis - Embryonic Development Nucleic Acids, Nucleotides, and Nucleosides - MicroRNAs RNA - MicroRNAs RNA, Small Untranslated - MicroRNAs Reproduction - Embryonic Development Ribonuclease III Skin Skin - Epidermis Skin - Hair Follicle