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Evolutionary changes in the notochord genetic toolkit: a comparative analysis of notochord genes in the ascidian Ciona and the larvacean Oikopleura

Jamie E Kugler, Pierre Kerner, Jean-Marie Bouquet, Di Jiang and Anna Di Gregorio*

BMC Evolutionary Biology 2011, 11:21  doi:10.1186/1471-2148-11-21