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Backlund MP, Lew MD, Backer AS, Sahl SJ, Grover G, Agrawal A, Piestun R, Moerner WE.Backlund MP, et al. Among authors: backer as.Proc Natl Acad Sci U S A. 2012 Nov 20;109(47):19087-92. doi: 10.1073/pnas.1216687109. Epub 2012 Nov 5.Proc Natl Acad Sci U S A. 2012.PMID: 23129640Free PMC article.