There are a number of ELISA Kits available for the measurement of Hyaluronidase PH20, another term for the human protein, sperm adhesion molecule 1. Other synonyms may include: hyaluronidase PH-20, PH-20 hyaluronidase, epididymis secretory sperm binding protein Li 96n, hyal-PH20, sperm adhesion molecule 1 (PH-20 hyaluronidase zona pellucida binding), sperm surface protein PH-20, and HEL-S-96n. It is encoded by the SPAM1 gene to yield a protein 509 amino acids in length and 57.8 kDa in size. However, there are up to 2 reported isoforms. The protein, an enzyme, is categorized into the Glycosyl hydrolase 56 family. Versions of Hyaluronidase PH20 are present in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.