Erb-b2 receptor tyrosine kinase 2 is a member of EGFR family. Erb-b2 receptor tyrosine kinase 2 is over-expressed in the tumors of many types of cancers. Erb-b2 receptor tyrosine kinase 2 enables ATP binding and transmembrane receptor protein tyrosine kinase activity. HER2/CD340 Protein, Rhesus Macaque (D121N, L122P, HEK293, Fc) is the recombinant cynomolgus-derived HER2/CD340 protein, expressed by HEK293 , with C-hFc labeled tag.