2IG2:
reference: [The primary structure of crystallizable monoclonal immunoglobulin IgG1 Kol. II. Amino acid sequence of the L-chain, gamma-type, subgroup I], Kratzin HD, Palm W, Stangel M, Schmidt WE, Friedrich J, Hilschmann N, Biol Chem Hoppe Seyler 1989 Mar;370(3):263-72. PMID: 2713105

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