ClustalW2, ClustallW, and ClustalX are general purpose, multiple sequence alignment tools. Multiple alignments of protein sequences can identify conserved sequence regions. This is useful in designing experiments to test and modify the function of specific proteins, in predicting the function and structure of proteins and in identifying new members of protein families. Clustal is a general purpose multiple sequence alignment program for DNA or proteins. ClustalW is the command line version and ClustalX is the graphical version of Clustal. The current version is ClustalW2. It produces biologically meaningful multiple sequence alignments of divergent sequences by calculating the best match for the selected sequences and lining them up so that the identities, similarities and differences can be seen. Evolutionary relationships can be seen via viewing Cladograms or Phylograms.
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