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ClustalW is a popular tool for multiple sequence alignment. The alignment is achieved via three steps: pairwise alignment, guide-tree generation and progressive alignment. ClustalW-MPI is an MPI implementation of ClustalW. Based on version 1.82 of the original ClustalW, both the pairwise and progressive alignments are parallelized with MPI, a popular message passing programming standard. The pairwise alignments can be easily parallelized since the many alignments are time independent on each other. However the progressive alignments are essentially not parallelizable because of the time dependencies between each alignment.