May be involved in ripening of fruits. Monomer. May cause an allergic reaction in human (PubMed:15507096, PubMed:16945416). Binds to IgE of patients allergic to strawberry, birch Bet v 1 and apple Mal d 1 (PubMed:15507096, PubMed:16945416). Causes degranulation of basophils sensitized with IgE of patients allergic to strawberry, birch Bet v 1 and apple Mal d 1 (PubMed:15507096). Belongs to the BetVI family.