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Shatzman AR, Henkin RI.Shatzman AR, et al. Among authors: henkin ri.Proc Natl Acad Sci U S A. 1981 Jun;78(6):3867-71. doi: 10.1073/pnas.78.6.3867.Proc Natl Acad Sci U S A. 1981.PMID: 6943587Free PMC article.
Henkin RI, Bradley DF.Henkin RI, et al.Proc Natl Acad Sci U S A. 1969 Jan;62(1):30-7. doi: 10.1073/pnas.62.1.30.Proc Natl Acad Sci U S A. 1969.PMID: 5253663Free PMC article.