Carrier Proteins/chemistry; Myosin Type V/chemistry; Myosin Type V/metabolism; rab GTP-Binding Proteins/metabolism; Adaptor Proteins, Signal Transducing; Alternative Splicing; Animals; Animals, Newborn; Carrier Proteins/metabolism; Cells, Cultured; Exons; Green Fluorescent Proteins; Kinetics; Luminescent Proteins/metabolism; Melanocytes/metabolism; Melanosomes/metabolism; Mice; Mice, Inbred C57BL; Microscopy, Fluorescence; Models, Genetic; Phenotype; Plasmids/metabolism; Protein Binding; Protein Isoforms; Protein Structure, Tertiary; Transfection; Two-Hybrid System Techniques; rab GTP-Binding Proteins/chemistry; rab27 GTP-Binding Proteins; rab3A GTP-Binding Protein/metabolism