FABP are thought to play a role in the intracellular transport of long-chain fatty acids and their acyl-CoA esters. Forms a beta-barrel structure that accommodates hydrophobic ligands in its interior. Causes an allergic reaction in human. Common symptoms of mite allergy are bronchial asthma, allergic rhinitis and conjunctivitis. Belongs to the calycin superfamily. Fatty-acid binding protein (FABP) family.