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Gardner JP, Pinches RA, Roberts DJ, Newbold CI.Gardner JP, et al. Among authors: newbold ci.Proc Natl Acad Sci U S A. 1996 Apr 16;93(8):3503-8. doi: 10.1073/pnas.93.8.3503.Proc Natl Acad Sci U S A. 1996.PMID: 8622966Free PMC article.