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iodine I 131 metaiodobenzylguanidine (I-oh-dine ... meh-tuh-I-oh-doh-BEN-zeel-GWAH-nih-deen)

 A radioactive substance that is used in imaging tests, and is being studied in the treatment of cancer. It is a type of radiopharmaceutical. Also called 131I-MIBG.



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