Filters allow you to group results based on your personal preferences. You can filter your search results in many NCBI databases. Available filters vary from database to database. In PubMed you can filter your results by publication type, language, and several other criteria. The example below shows how to display filter tabs in PubMed. To create filter tabs to group your results.
After you run your searches in PubMed you will now see your customized filters to the right of the results. Click on one of the filter text links to
display only those references corresponding to the selected filter. You can access and manage your filters by using the "Manage filters" text link below your custom filters.
Note that your customized filters are different from PubMed's after-search filters (which have replaced PubMed Limits), shown on the left, that display many ways to narrow your searches.