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Conservation, loss, and redeployment of Wnt ligands in protostomes: implications for understanding the evolution of segment formation

Ralf Janssen, Martine Le Gouar, Matthias Pechmann, Francis Poulin, Renata Bolognesi, Evelyn E Schwager, Corinna Hopfen, John K Colbourne, Graham E Budd, Susan J Brown, Nikola-Michael Prpic, Carolin Kosiol, Michel Vervoort, Wim GM Damen*, Guillaume Balavoine* and Alistair P McGregor*

BMC Evolutionary Biology 2010, 10:374  doi:10.1186/1471-2148-10-374