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We report the synthesis and biological evaluation of 131I‐labeled antihuman tumor‐derived immunoglobulin G (IgG) light chain monoclonal antibody (4E9) ([131I]I‐4E9) as a promising probe for tumor imaging. [131I]I‐4E9 was synthesized in radiochemical yield of 89.9 ± 4.7% with radiochemical purity of more than 99%. [131I]I‐4E9 showed high stability in normal saline and human serum. In cell uptake studies,...