All Those ID Numbers
The PMID is a unique identifier that you can use to quickly find and share citations. Simply enter the PMID in the Search box, or share it with colleagues.
Another important number is the PMCID - the unique ID number for items in PubMed Central (PMC). PMC is the depository where all articles that result from NIH funding are required to be placed. Some journals automatically deposit articles on behalf of the authors. All are supposed to do so after a 6 month embargo. The idea is that taxpayer-funded research should be freely available to taxpayers in a timely fashion.