Erythropoietin ( EPO ) and its receptor ( EPOR ) are required for the development of mature erythrocytes .
erythropoietin ( epo ) and its receptor ( epor ) are required for the development of mature erythrocytes .
B-protein_family_or_group O B-protein_family_or_group O O O O O B-protein_family_or_group O O O O O O O O O O