an S-alkyl-L-cysteine S-oxide = 2-aminoprop-2-enoate + an S-alkyl sulfenate Homodimer. The 6 Cys residues of the EGF-like domain are arranged in a disulfide pattern different from the one found in the canonical EGFs. The function of this domain is unclear. It may be a binding site for other proteins or the docking site for a putative alliinase receptor (By similarity). Belongs to the alliinase family.