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Spera JM, Ugalde JE, Mucci J, Comerci DJ, Ugalde RA.Spera JM, et al. Among authors: ugalde ra, ugalde je.Proc Natl Acad Sci U S A. 2006 Oct 31;103(44):16514-9. doi: 10.1073/pnas.0603362103. Epub 2006 Oct 19.Proc Natl Acad Sci U S A. 2006.PMID: 17053080Free PMC article.