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Schaffitzel C, Berger I, Postberg J, Hanes J, Lipps HJ, Plückthun A.Schaffitzel C, et al. Among authors: postberg j.Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8572-7. doi: 10.1073/pnas.141229498. Epub 2001 Jul 3.Proc Natl Acad Sci U S A. 2001.PMID: 11438689Free PMC article.