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Correspondence

Physics Department, Guy's Hospital Medical School, London, S.E.1

This excerpt was created in the absence of an abstract.

With reference to the paper by Bloom, Crockett, Ekins, Ledlie, Taylor and Vassar (1956) on the stability of radio-active iodinated serum albumin preparations, it would appear that the unsatisfactory nature of the product distributed by the Radiochemical Centre might reasonably be accounted for by radiation damage to the protein. Recently Yalow and Berson (1956) have demonstrated that 50,000 r delivered over a half-hour period to a solution containing 20 mg per cent seriously affected the survival in vivo of labelled protein.