“DATE ACO. Penne,‘ N1, SeocksrokTHIS—Au-Sex.63, 2.9-5-59. A6-Bep63------- te--S---63—L---6-OF-a-FO1 Is UNEVALUATED INFORMATIONS SOURCE: US nuclear biologist. - " He is head of the pharmacology operation of a major US - atomic labora- tory. .. %s•*-■ .1 1. In late August”