National BioResource Project (NBRP)
The National BioResource Project (NBRP) for Xenopus tropicalis in Japan is driven by Amphibian Research Center (ARC) of Hiroshima University for establishment of the Xenopus research resource core in Asia. The project is supported by Japan Agency for Medical Research and Development (AMED). Currently, the main resources are highly inbred wild-type strains of X tropicalis, and their derivatives (Reference: Igawa, T. et al. Inbreeding ratio and genetic relationships among strains of the western clawed frog, Xenopus tropicalis. PLoS One, 10: e0133963, 2015.).