PROBLEM TO BE SOLVED: To provide a homogeneous antibody population. A monoclonal IgG2 antibody comprising: a light chain polypeptide; and a heavy chain polypeptide having a hinge region, said antibody comprising amino acid modifications in said heavy or light chain polypeptide, such that Monoclonal IgG2 wherein the modification provides a light chain polypeptide that forms predominantly interchain disulfide bonds only with amino acids in the hinge region of the heavy chain polypeptide through the most C-terminal cysteine residue of the light chain polypeptide. antibody. [Selection diagram] Figure 1B【課題】均質な抗体集団の提供。【解決手段】モノクローナルIgG2抗体であって:軽鎖ポリペプチドと;ヒンジ領域を有する重鎖ポリペプチドと、を含み、前記抗体が前記重鎖または軽鎖ポリペプチドにおいてアミノ酸修飾を含み、その結果、前記修飾が、前記軽鎖ポリペプチドの最もC末端側のシステイン残基を通じて前記重鎖ポリペプチドのヒンジ領域におけるアミノ酸とのみ主に鎖間ジスルフィド結合を形成する軽鎖ポリペプチドを提供する、モノクローナルIgG2抗体。【選択図】図1B