Ready-to-use ELISA kits are available for the detection of sas-4, an alias of the protein, centromere protein J. The official gene symbol is CENPJ. The protein, with a mass of 153 kDa and length of 1338 residues, is reported to be cytoplasmic. It is a member of the TCP10 family and may be known by other names, including: BM032, centrosomal P4.1-associated protein, LYST-interacting protein LIP7, LYST-interacting protein LIP1, LYST-interacting protein 1, and LAG-3-associated protein, and CPAP.