A couple of weeks ago there was a change made in PubMed that moved the limits/filters to the results screen on the left hand side.   Now discovery tools have been added to the results page.   The two tools that will be displayed are PubMed "Results by year" and PubMed Central "PMC images search"  in the discovery column for all PubMed users on the right hand side.  These tools are intended to help users access more of the information and image resources that are contained in PubMed. 


For more information click on the following link:  PubMed Discovery Tools