As of May 25, 2008, all NIH applications, proposals, and progress reports have to include the PubMed Central reference number (PMCID) when citing a paper that falls under the policy* and was authored or co-authored by the investigator, or arose from the investigator’s NIH award. This policy includes applications submitted to the NIH for the May 25, 2008 due date and subsequent due dates.
*The Policy applies to you if your peer-reviewed article is based on work directly funded by a NIH grant or cooperative agreement active in Fiscal Year 2008 (October 1, 2007- September 30, 2008) or beyond.
There are several ways to find the PubMed Central ID (PMCID):
A typical citation will look something like this in PubMed Central, where the PMCID has been bolded:
Species differences in brain gene expression profiles associated with adult behavioral maturation in honey bees
Moushumi Sen Sarma, Charles W Whitfield, and Gene E Robinson
BMC Genomics. 2007; 8: 202. Published online 2007 June 29. doi: 10.1186/1471-2164-8-202.
The same citation in PubMed would have looked like this, with the PubMed ID (PMID) bolded:
Sen Sarma M, Whitfield CW, Robinson GE.
Species differences in brain gene expression profiles associated with adult behavioral maturation in honey bees.
BMC Genomics. 2007 Jun 29;8:202.