3FEK CRYSTAL STRUCTURE OF THE R132K:Y134F:R111L:L121D:T54V MUTANT OF CELLULAR RETINOIC ACID-BINDING PROTEIN II AT 1.51 ANSTROM RESOLUTION TRANSPORT PROTEIN, CRABPII, RETINOIC ACID, RETINOID, CYTOPLASM, NUCLEUS, RETINOL-BINDING, TRANSPORT, VITAMIN A