PubMed/MEDLINE citations, the MeSH database, and the NLM Catalog were updated to reflect 2013 MeSH on December 10, 2013. The MeSH translation tables were also updated. Now that end-of-year activities are complete, MEDLINE/PubMed may be searched using 2013 MeSH vocabulary. For details on the data changes, go to MEDLINE Data Changes — 2013. On December 11, NLM resumed daily (Tuesday-Saturday) MEDLINE updates to PubMed, including the backlog of citations indexed since November 14 with 2013 MeSH.