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Szoka F Jr, Papahadjopoulos D.Szoka F Jr, et al. Among authors: papahadjopoulos d.Proc Natl Acad Sci U S A. 1978 Sep;75(9):4194-8. doi: 10.1073/pnas.75.9.4194.Proc Natl Acad Sci U S A. 1978.PMID: 279908Free PMC article.