Development of Erythroid Progenitors under Erythropoietin Stimulation in Xenopus laevis Larval Liver Okui, Takehito and Hosozawa, Sakiko and Kohama, Satoka and Fujiyama, Shingo and Maekawa, Shun and Muto, Hiroshi and Kato, Takashi, Zoological Science, 33, 575-582 (2016), DOI:http://dx.doi.org/10.2108/zs160040