Enhancer Elements, Genetic; Eye Proteins/genetics; Homeodomain Proteins/genetics; Paired Box Transcription Factors/genetics; Pancreas/metabolism; Repressor Proteins/genetics; Zebrafish Proteins/genetics; Zebrafish/genetics; Animals; Animals, Genetically Modified; Base Sequence; Conserved Sequence; DNA-Binding Proteins/chemistry; DNA-Binding Proteins/metabolism; Gene Expression Regulation, Developmental; Green Fluorescent Proteins/genetics; Green Fluorescent Proteins/metabolism; Homeodomain Proteins/chemistry; Homeodomain Proteins/metabolism; Molecular Sequence Data; Multiprotein Complexes; PAX6 Transcription Factor; Pancreas/embryology; Promoter Regions, Genetic; RNA, Messenger/genetics; RNA, Messenger/metabolism; Recombinant Fusion Proteins/genetics; Recombinant Fusion Proteins/metabolism; Retina/embryology; Retina/metabolism; Sequence Homology, Nucleic Acid; Telencephalon/embryology; Telencephalon/metabolism; Trans-Activators/chemistry; Trans-Activators/metabolism; Transcription Factors/chemistry; Transcription Factors/metabolism; Zebrafish/embryology; Zebrafish/metabolism; Zebrafish Proteins/chemistry; Zebrafish Proteins/metabolism