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In the communication by Silberberg, "Phenylketonuria Metabolites in Cerebellum Culture Morphology" (Archives 17:524-529 [Nov] 1967), there is an error on line 31, page 525. The sentence should have read: "There were 312 [not 12] cultures used as controls, and specific comparisons were made with experimental cultures explanted from the same cerebellum in each experiment."