The professional guidelines and clinical literature sections in MedGen. (A) For each professional guideline the title, list of authors, and the journal information are presented in a “Professional guidelines” section, which include PMID and links to PMC, if available. The results from clinical queries in PubMed are presented in a (B) “Recent clinical studies” section under five Clinical Study Categories: Etiology, Diagnosis, Prognosis, Therapy, and Clinical prediction guides. The results of using the systematic reviews filter in the PubMed Clinical Queries are displayed in (C) Recent Systematic Reviews section with similar format. If available the link to the free article in PMC is included.