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An insoluble macromolecular Sn(II)(R-Sn) complex which strongly binds Sn(II) by chelation was applied to the direct 99m Tc labeling of human immunoglobulin(IgG) to minimize the influence of Sn(II). 99m Tc labeling was achieved at greater than 90% yield simply by the short-term mixing of IgGa containing >2 -SH groups per IgG molecule, 99m Tc...