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Anderson GR, Kovacik WP Jr.Anderson GR, et al. Among authors: kovacik wp jr.Proc Natl Acad Sci U S A. 1981 May;78(5):3209-13. doi: 10.1073/pnas.78.5.3209.Proc Natl Acad Sci U S A. 1981.PMID: 6942426Free PMC article.