DrugBank ID: DB00072 https://go.drugbank.com/drugs/DB00072 Heavy chains' C-terminal K residues are deleted for Herceptin (Chugai Pharmaceutical Co., Ltd., Tokyo, Japan), commercially available trastuzumab, according to the information in PMDA (Pharmaceuticals and Medical Devices Agency): Review report regarding the anti-HER2 humanized monoclonal antibody Herceptin® Injection 60 and 150, on Jan. 16th 2008 (https://www.pmda.go.jp/drugs/2007/P200700066/45004500_21300AMY00128_A100_2.pdf).