Protein Structure and Bioinformatics Group, International Center for Genetic Engineering and Biotechnology, AREA Science Park, Padriciano 99, 34012 Trieste, Italy. pintar@icgeb.org|Protein Structure and Bioinformatics Group, International Center for Genetic Engineering and Biotechnology, AREA Science Park, Padriciano 99, 34012 Trieste, Italy. pintar@icgeb.org|Protein Structure and Bioinformatics Group, International Center for Genetic Engineering and Biotechnology, AREA Science Park, Padriciano 99, 34012 Trieste, Italy. pintar@icgeb.org