Affiliation: | 1. Departamento de Bioquímica y Biología Molecular, Centro de Biología Molecular (C.S.I.C.-U.A.M.), Universidad Autónoma de Madrid, 34, Madrid, Spain 2. Department of Biochemistry, Tufts School of Medicine, 02111, Boston, Massachussets, USA 3. Laboratory of Molecular Biology, Universidade Federal do Rio de Janeiro, Ilha do Fundao, Rio de Janeiro, Brasil
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