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Casas-Finet JR, Smith JD Jr, Kumar A, Kim JG, Wilson SH, Karpel RL.Casas-Finet JR, et al.J Mol Biol. 1993 Feb 20;229(4):873-89. doi: 10.1006/jmbi.1993.1093.J Mol Biol. 1993.PMID: 8445653