The master sex-determination locus in threespine sticklebacks is on a nascent Y chromosome, Peichel Catherine L, Ross Joseph A, Mori Seiichi, Grimwood Jane, Schmutz Jeremy, Myers Richard M, Kingsley David M, Matson Clinton K, Dickson Mark, and Schluter Dolph, Current Biology, 2004 Aug 24, Volume 14, Issue 16, p.1416-24 (2004)