Could play a role in taste reception. Could be necessary for the concentration and delivery of sapid molecules in the gustatory system. Can bind various ligands, with chemical structures ranging from lipids and retinoids to the macrocyclic antibiotic rifampicin and even to microbial siderophores. Exhibits an extremely wide ligand pocket (By similarity). Predominantly monomer (By similarity). May form homodimer (By similarity). Interacts with LMBR1L; this interaction mediates the endocytosis of LCN1 (By similarity). Belongs to the calycin superfamily. Lipocalin family.