4LY7:
reference: Thermodynamic system drift in protein evolution., Hart KM, Harms MJ, Schmidt BH, Elya C, Thornton JW, Marqusee S, PLoS Biol. 2014 Nov 11;12(11):e1001994. doi: 10.1371/journal.pbio.1001994., eCollection 2014 Nov. PMID: 25386647

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