Anti-PLB antibodies enable researchers to detect and measure the PLB antigen in biological samples. This target is a reported synonym of the PLN gene, which encodes phospholamban. This protein is known to function in the regulation of intracellular calcium, among other biological roles. The human version of PLB has a canonical amino acid length of 52 residues and a protein mass of 6.1 kilodaltons. It is reported to be localized in the mitochondria and ER of cells and notably expressed in the kidney, heart muscle, endometrium, colon, and cerebral cortex. PLB is a member of the Phospholamban protein family.