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Brannigan JA, Dodson G, Duggleby HJ, Moody PC, Smith JL, Tomchick DR, Murzin AG (novembro de 1995). "A protein catalytic framework with an N-terminal nucleophile is capable of self-activation". Nature378 (6555): 416–9. PMID7477383. doi:10.1038/378416a0.