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Gardner PR, Gardner AM, Martin LA, Salzman AL.Gardner PR, et al. Among authors: gardner am.Proc Natl Acad Sci U S A. 1998 Sep 1;95(18):10378-83. doi: 10.1073/pnas.95.18.10378.Proc Natl Acad Sci U S A. 1998.PMID: 9724711Free PMC article.