Provided below are ELISA kits targeting sperm tail PG-rich repeat containing 1, a human protein encoded by STPG1. This protein is 334 amino acids long, with a mass of 36.8 kDa, and is a member of the STPG1 family. 3 isoforms have been identified. This is reported to be a cytoplasmic and nuclear protein. Other alias names for this protein include: O(6)-methylguanine-induced apoptosis 2, O6-methylguanine-induced apoptosis 2, UPF0490 protein C1orf201, sperm-tail PG-rich repeat-containing protein 1, and O6-methylguanine-induced apoptosis 2.