Singhal S, Leffler EM, Sannareddy K, Turner I, Venn O, Hooper DM, Strand AI, Li Q, Raney B, Balakrishnan CN, Griffith SC, McVean G, Przeworski M. Stable recombination hotspots in birds. Science. 2015 11 20; 350(6263):928-32.