A subset of structures from which homologous sequences have been largely removed can be obtained from the result list of a query. This option--which is activated by selecting the "remove sequence homologs" option on SearchLite, SearchFields, and the PDB home page-- filters subsets of structures that match a particular query. The default threshold for sequence similarity removal for queries from the home page or SearchLite is 90%; SearchFields provides the option of selecting 50, 70, or 90% similarity as cut-off values. Users can toggle between the complete set of results and the reduced subset by using the options menu at the top of the Query Result Browser.
Further information about this feature is available at http://www.rcsb.org/pdb/redundancy.html.
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