Cell Differentiation/physiology; Cerebral Cortex; Embryonic Stem Cells/physiology; Neurogenesis/physiology; Transcription Factor AP-2/physiology; Adult; Animals; Bromodeoxyuridine/metabolism; Cell Count/methods; Cell Line, Transformed; Cerebral Cortex/cytology; Cerebral Cortex/embryology; Cerebral Cortex/growth & development; Embryo, Mammalian; Evoked Potentials, Visual/genetics; Evoked Potentials, Visual/physiology; Eye Proteins/genetics; Eye Proteins/metabolism; Fetus; Gene Deletion; Gene Expression Regulation, Developmental/genetics; Gene Expression Regulation, Developmental/physiology; Green Fluorescent Proteins/genetics; Homeodomain Proteins/genetics; Homeodomain Proteins/metabolism; Humans; Immediate-Early Proteins/genetics; Ki-67 Antigen/metabolism; Macaca fascicularis; Mice; Mice, Inbred C57BL; Mice, Transgenic; PAX6 Transcription Factor; Paired Box Transcription Factors/genetics; Paired Box Transcription Factors/metabolism; Photic Stimulation/methods; RNA, Messenger/metabolism; Repressor Proteins/genetics; Repressor Proteins/metabolism; T-Box Domain Proteins/metabolism; Transcription Factor AP-2/genetics; Transcription Factors/genetics; Transfection/methods; Tumor Suppressor Proteins/genetics