Erythropoietin ( Epo ) , the primary regulator of the production of erythroid cells , acts by binding to a cell surface receptor ( EpoR ) on erythroid progenitors .
erythropoietin ( epo ) , the primary regulator of the production of erythroid cells , acts by binding to a cell surface receptor ( epor ) on erythroid progenitors .
B-protein_molecule O B-protein_molecule O O O O O O O O O B-cell_type I-cell_type O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_molecule O O B-cell_type I-cell_type O