Ready-to-use ELISA kits are available for the detection of casein kinase 1, delta, an alias of the protein, casein kinase 1 delta. The official gene symbol is CSNK1D. The protein, with a mass of 47.3 kDa and length of 415 residues, is reported to be cytoplasmic, nuclear and membrane-associated. It is a member of the Protein kinase superfamily, CK1 Ser/Thr protein kinase family, Casein kinase I subfamily and may be known by other names, including: CKIdelta, CKId, ASPS, tau-protein kinase CSNK1D, casein kinase I, and casein kinase I isoform delta, and HCKID.