1. Protein Structure Prediction Center, Genome Center; University of California; Davis California
2. Institute for Bioscience and Biotechnology Research and Department of Cell Biology and Molecular Genetics; University of Maryland; Maryland
3. Biozentrum, University of Basel; Basel Switzerland
4. SIB Swiss Institute of Bioinformatics; Basel Switzerland
5. Department of Biochemical Sciences; Sapienza - University of Rome, P. le A. Moro, 5; Rome 00185