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URL: http://scholar.google.com/scholar_lookup?title=Nf1+regulates+hematopoietic+progenitor+cell+growth+and+ras+signaling+in+response+to+multiple+cytokines.&year=1998&author=Zhang&journal=J+Exp+Med.&volume=187&issue=11&pages=1893-1902&doi=10.1084%2Fjem.187.11.1893&pmid=9607929