TY - JOUR T1 - Positive and strongly relaxed purifying selection drive the evolution of repeats in proteins JF - Nature Communications Y1 - 2016 A1 - Persi, Erez A1 - Wolf, Yuri I. A1 - Koonin, Eugene V VL - 7 UR - http://www.nature.com/doifinder/10.1038/ncomms13570 J1 - Nat Comms M3 - 10.1038/ncomms13570 ER -