Protein sequences can provide data about the biological function and evolution of proteins and protein domains. Grouping and interrelating protein sequences can therefore provide information about both human biological processes, and the evolutionary development of biological processes on earth.
Such Sequence clusters allow the effective coverage of sequence space.
Sequence clusters can reduce a large database of sequences to a smaller set of sequence representatives, each of which should represent its cluster at the sequence level.
Sequence representatives allow the effective coverage of the original database with fewer sequences. The database of sequence representatives is called non-redundant, as similar (or redundant) sequences have been removed at a certain similarity threshold.
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