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Schaefer AL, Val DL, Hanzelka BL, Cronan JE Jr, Greenberg EP.Schaefer AL, et al. Among authors: greenberg ep.Proc Natl Acad Sci U S A. 1996 Sep 3;93(18):9505-9. doi: 10.1073/pnas.93.18.9505.Proc Natl Acad Sci U S A. 1996.PMID: 8790360Free PMC article.