PubMed Central Identification Number

After scrutinizing quite a few results at PubMed, I am having a very hard time finding a record that provides the PMCID number in the MEDLINE format.

Would you be so kind as to provide the PubMed ID for one of these records, that I might have a look?

Thanks,

SteveH
Customer Technical Support Group Leader
Global Customer Support
Thomson Reuters
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http://www.researchsoft.com
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