Phospho-ErbB2 (HER-2) (Tyr1139) Recombinant Monoclonal Antibody for ICC/IF, IHC (P), ELISA ErbB2 (HER2) is a receptor tyrosine kinase that is overexpressed in some breast tumors. Herceptin, used in treatment of metastatic Her2-positive cancer, is monoclo