Anti-Testican antibodies enable researchers to detect and measure the Testican antigen in biological samples. This target is a reported synonym of the SPOCK1 gene, which encodes SPARC (osteonectin), cwcv and kazal like domains proteoglycan 1. This protein is known to function in cell adhesion and central nervous system neuron differentiation, among other biological roles. The human version of Testican has a canonical amino acid length of 439 residues and a protein mass of 49.1 kilodaltons. It is reported to be localized in the extracellular matrix and is secreted of cells. Other names for this target antigen include SPOCK and SPOCK.