On the left hand side there are various limits that patrons can use to focus the search results such as publication type, date ranges, and publication name. There is also a new set of limits called biomedical limits, based off of Medical Subject Headings or MeSH.
The Filters displayed can help identify areas of further research such as age group, medical, study type, and subject subset.
In order to view the terms used to develop the filter in question, select the filter and add it to the search. Then select the "i" icon next to the filter.