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Ray J, Baird A, Gage FH.Ray J, et al. Among authors: gage fh.Proc Natl Acad Sci U S A. 1997 Jun 24;94(13):7047-52. doi: 10.1073/pnas.94.13.7047.Proc Natl Acad Sci U S A. 1997.PMID: 9192689Free PMC article.