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