Expressed in submaxillary gland (at protein level). Not N-linked glycosylated. Causes an allergic reaction in human. Binds to IgE in 54% of the 26 patients tested allergic to guinea pigs. Causes degranulation of humanized rat basophil leukemia cells (RBL) and release of beta-hexosaminidase. Belongs to the calycin superfamily. Lipocalin family.