1. Alignment-Free Vinga and Almeida Library http://bioinformatics.musc.edu/resources. html
2. CATH DataBase http://www.cathdb.info/
3. Galaxy/Laboratory for Bioinformatics-Padova http://bcb.dei.unipd.it/
4. GPCRIPDB: Information system for GPCR interacting proteins http://www.gpcr.org
5. GPCRIPDB: Information system for GPCR interacting proteins http://www.gpcr.org/ GPCRIP/multali/multali.html