Anti-TSPY like 4 antibodies are used in the immunodetection of the protein encoded by the TSPYL4 gene. In humans, the canonical protein has a reported length of 414 amino acid residues and a mass of 45.1 kDa. The TSPY like 4 protein is a member of the Nucleosome assembly protein (NAP) protein family. Other names for this target antigen include testis-specific Y-encoded-like protein 4, TSPY-like protein 4, and dJ486I3.2.