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URL: http://scholar.google.com/scholar_lookup?title=The+dual+roles+of+red+blood+cells+in+tissue+oxygen+delivery%3A+oxygen+carriers+and+regulators+of+local+blood+flow&year=2009&author=Jensen&journal=J+Exp+Biol&volume=212&issue=Pt+21&pages=3387-3393&pmid=19837879