The paper describing Clustal V came out earlier this year in CABIOS:
Higgins, D.G., Bleasby, A.J. and Fuchs, R. (1992)
CLUSTAL V: improved software for multiple sequence alignment.
Computer Applications in the Biosciences (CABIOS), 8(2):189-191.
Des Higgins
European Molecular Biology Laboratory
Heidelberg
Germany Higgins at EMBL-Heidelberg.DE
