Ready-to-use ELISA kits are available for the detection of testis-specific protein, Y-encoded-like 1, an alias of the protein, TSPY like 1. The official gene symbol is TSPYL1. The protein, with a mass of 49.2 kDa and length of 437 residues, is reported to be nuclear. It is a member of the Nucleosome assembly protein (NAP) family and may be known by other names, including: TSPYL, TSPY-like protein 1, and testis-specific Y-encoded-like protein 1.