Ready-to-use ELISA kits are available for the detection of Hya1, an alias of the protein, sperm adhesion molecule 1. The official gene symbol is SPAM1. The protein, with a mass of 57.8 kDa and length of 509 residues, is reported to be membrane-associated. It is a member of the Glycosyl hydrolase 56 family and may be known by other names, including: sperm surface protein PH-20, hyal-PH20, epididymis secretory sperm binding protein Li 96n, PH-20 hyaluronidase, and hyaluronidase PH-20, and HYA1.