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Ylinen AM, Miettinen R, Pitkänen A, Gulyas AI, Freund TF, Riekkinen PJ.Ylinen AM, et al. Among authors: freund tf.Proc Natl Acad Sci U S A. 1991 Sep 1;88(17):7650-3. doi: 10.1073/pnas.88.17.7650.Proc Natl Acad Sci U S A. 1991.PMID: 1652757Free PMC article.