FABP are thought to play a role in the intracellular transport of long-chain fatty acids and their acyl-CoA esters. Highest expression in early stages of retinal development with a 50-100 fold decrease from day 3 to day 19 of retina maturation. Forms a beta-barrel structure that accommodates hydrophobic ligands in its interior. Belongs to the calycin superfamily. Fatty-acid binding protein (FABP) family.