Ready-to-use ELISA kits are available for the detection of polo-like kinase 1, an alias of the protein, polo like kinase 1. The official gene symbol is PLK1. The protein, with a mass of 68.3 kDa and length of 603 residues, is reported to be cytoplasmic and nuclear. It is a member of the Protein kinase superfamily, Ser/Thr protein kinase family, CDC5/Polo subfamily and may be known by other names, including: STPK13, PLK, polo (Drosophia)-like kinase, cell cycle regulated protein kinase, PLK-1, and serine/threonine-protein kinase PLK1.