COMPASS runs a search with submitted alignment (or sequence) as a query against a database of protein families.
:: MORE INFORMATION
R.I. Sadreyev, M. Tang, B. Kim and N.V. Grishin (2009)
COMPASS server for homology detection: improved statistical accuracy, speed, and functionality.
Nucleic Acids Res doi:10.1093/nar/gkp360.