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Cirino G, Peers SH, Flower RJ, Browning JL, Pepinsky RB.Cirino G, et al. Among authors: flower rj.Proc Natl Acad Sci U S A. 1989 May;86(9):3428-32. doi: 10.1073/pnas.86.9.3428.Proc Natl Acad Sci U S A. 1989.PMID: 2470103Free PMC article.