Presence of activin (erythroid differentiation factor) in unfertilized eggs and blastulae of Xenopus laevis.
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D. Ejima | N. Ueno | M. Asashima | S. Nishimatsu | Y. Eto | H. Sugino | K. Kinoshita | T. Nakamura | H. Uchiyama | H. Nakano | Takanori Nakamura