Institute of Biological Sciences and Department of Computer Science, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil and Centro Universitário de Belo Horizonte/UNI-BH, Belo Horizonte, MG 30455-610, Brazil.|Institute of Biological Sciences and Department of Computer Science, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil and Centro Universitário de Belo Horizonte/UNI-BH, Belo Horizonte, MG 30455-610, Brazil.|Institute of Biological Sciences and Department of Computer Science, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil and Centro Universitário de Belo Horizonte/UNI-BH, Belo Horizonte, MG 30455-610, Brazil.