Anti-Tpx1 antibodies enable researchers to detect and measure the Tpx1 antigen in biological samples. This target is a reported synonym of the CRISP2 gene, which encodes cysteine rich secretory protein 2. This protein is believed to regulate some ion channels' activity and therebye regulate calcium fluxes during sperm capacitation. The human version of Tpx1 has a canonical amino acid length of 243 residues and a protein mass of 27.3 kilodaltons, although 2 isoforms have been identified. It is reported to be a secreted protein that is notably expressed in the testis. Tpx1 is a member of the CRISP protein family.