The immunogen used to the purified peptide conjugated to KLH corresponding to the sequence NH2-Pro-Arg-Thr-Ala-Asn-Pro-Pro-Lys-LysArg-COOH. This peptide antibody corresponds to C -terminal peptide of PP1 beta catalytic subunit having a MW of 38kD. The sequence used is amino acid 318-327. Synonyms: pp1b, sheep anti protein phosphatase 1 beta.