CLustal References:

Jeanmougin,F., Thompson,J.D., Gouy,M., Higgins,D.G. and Gibson,T.J. (1998)
Multiple sequence alignment with Clustal X. Trends Biochem Sci, 23, 403-5.

Thompson,J.D., Gibson,T.J., Plewniak,F., Jeanmougin,F. and Higgins,D.G. (1997)
The ClustalX windows interface: flexible strategies for multiple sequence 
alignment aided by quality analysis tools. Nucleic Acids Research, 24:4876-4882.
Higgins, D. G., Thompson, J. D. and Gibson, T. J. (1996) Using CLUSTAL for
multiple sequence alignments. Methods Enzymol., 266, 383-402.

Thompson, J.D., Higgins, D.G. and Gibson, T.J. (1994) CLUSTAL W: improving the
sensitivity of progressive multiple sequence alignment through sequence
weighting, positions-specific gap penalties and weight matrix choice.  Nucleic
Acids Research, 22:4673-4680.

Higgins,D.G., Bleasby,A.J. and Fuchs,R. (1992) CLUSTAL V: improved software for
multiple sequence alignment. CABIOS 8,189-191.

Higgins,D.G. and Sharp,P.M. (1989) Fast and sensitive multiple sequence
alignments on a microcomputer. CABIOS 5,151-153.

Higgins,D.G. and Sharp,P.M. (1988) CLUSTAL: a package for performing multiple
sequence alignment on a microcomputer. Gene 73,237-244.