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(A) Wild-type and mutant λ NUTL sequences. (B) Part of the λ pL transcript showing NUTL, the RNaseIII-sensitive structure in mature λ pL transcript, and the beginning of the N gene. The nun1 and nun3 mutations are indicated. (C) An RNaseIII-sensitive site thought to form during λ pL transcription (9, 10). The nun3 mutation is indicated.
