@article {49815,
	title = {Positive and strongly relaxed purifying selection drive the evolution of repeats in proteins},
	journal = {Nature Communications},
	volume = {7},
	year = {2016},
	month = {Jun-11-2017},
	pages = {13570},
	doi = {10.1038/ncomms13570},
	url = {http://www.nature.com/doifinder/10.1038/ncomms13570},
	author = {Persi, Erez and Wolf, Yuri I. and Koonin, Eugene V}
}
