Hi Diana,

The PMCID number (PubMed Central reference number) is used at the end of citations.  These must be used by anyone submitting an application, proposal or report to the NIH when citing applicable papers that they author or that arise from their NIH-funded research.  I’ve included a link which goes into more detail if interested.

http://publicaccess.nih.gov/citation_methods.htm

Best,

Angie Rossbach
Grants Coordinator
Research & Sponsored Programs
University of Toledo-HSC
419-383-4252
Fax: 419-383-4262

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