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A phrase was omitted from A. D. Kelmers' and M. P. Stulberg'sletter "Purified Transfer RNA's" on page 238 of the 16 Januaryissue. The sentence should have read: "The following transferRNA's from E. coli K-12 MO7, fMet (97 percent), Arg (70 percent),Phe 2 (78 percent), and Glu (95 percent), and from E. coli K-12MO, fMet (95 percent), Arg (100 percent), and Glu (85 percent)are ready for distribution."