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Huang G, Santos-Sacchi J.Huang G, et al.Proc Natl Acad Sci U S A. 1994 Dec 6;91(25):12268-72. doi: 10.1073/pnas.91.25.12268.Proc Natl Acad Sci U S A. 1994.PMID: 7991617Free PMC article.