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Steller MA, Delgado CH, Zou Z.Steller MA, et al.Proc Natl Acad Sci U S A. 1995 Dec 19;92(26):11970-4. doi: 10.1073/pnas.92.26.11970.Proc Natl Acad Sci U S A. 1995.PMID: 8618825Free PMC article.