2 European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SD, UK.
3 Ideaconsult Ltd., Sofia, Bulgaria.
4 Institute of Chemistry, Campus Merida, National Autonomous University of Mexico, Merida-Tetiz Highway, Km. 4.5, Ucú, Yucatán, Mexico.
5 Institute for Applied Mathematics and Systems, Merida Research Unit, National Autonomous University of Mexico, Sierra Papacal, Merida, Yucatan, Mexico.