Ready-to-use ELISA kits are available for the detection of phosphorylase kinase, an alias of the protein, phosphorylase kinase regulatory subunit alpha 2. The official gene symbol is PHKA2. The protein, with a mass of 138.4 kDa and length of 1235 residues, is reported to be membrane-associated. It is a member of the Phosphorylase b kinase regulatory chain family and may be known by other names, including: PYK, PHK, phosphorylase kinase alpha 2 (liver), phosphorylase kinase alpha-subunit, phosphorylase kinase alpha L subunit, and XLG.