Cell Proliferation; Epidermis/metabolism; Keratinocytes/cytology; TATA-Binding Protein Associated Factors/metabolism; TATA-Binding Protein Associated Factors/physiology; Transcription Factor TFIID/metabolism; Transcription Factor TFIID/physiology; Tumor Suppressor Proteins/metabolism; Animals; Cell Differentiation/genetics; Epidermis/embryology; Epidermis/pathology; Female; Genetic Predisposition to Disease; Hair/cytology; Hair/embryology; Hyperplasia/chemically induced; Male; Mice; Mice, Knockout; Nevus, Pigmented/chemically induced; Nevus, Pigmented/genetics; Protein Subunits/physiology; Skin Neoplasms/chemically induced; Skin Neoplasms/pathology; TATA-Binding Protein Associated Factors/genetics; Transcription Factor TFIID/genetics; Tretinoin/adverse effects; Tumor Suppressor Proteins/physiology