vasa and nanos expression patterns in a sea anemone and the evolution of bilaterian germ cell specification mechanisms

vasa and nanos expression patterns in a sea anemone and the evolution of bilaterian germ cell specification mechanisms. Extavour, C.G., Pang, K., Matus, D.Q. and Martindale, M.Q.. Evolution and Development, 7(3): 201-215 (2005)