Anti-Crt1 antibodies enable researchers to detect and measure the Crt1 antigen in biological samples. This target is a reported synonym of the HAPLN1 gene, which encodes hyaluronan and proteoglycan link protein 1. This protein is known to function in cell adhesion and glial cell differentiation, among other biological roles. The human version of Crt1 has a canonical amino acid length of 354 residues and a protein mass of 40.2 kilodaltons. It is reported to be localized in the extracellular matrix and is secreted of cells and notably expressed in the placenta and testis. Crt1 is a member of the HAPLN protein family.