has part has part lacks_plasma_membrane_part bearer of has characteristic has plasma membrane part develops from develops from erythroid progenitor cell proerythroblast FMA:83518 rubriblast pronormoblast An immature, nucleated erythrocyte occupying the stage of erythropoeisis that follows formation of erythroid progenitor cells. This cell is CD71-positive, has both a nucleus and a nucleolus, and lacks hematopoeitic lineage markers. erythroid lineage cell nucleate cell basophilic cytoplasm nucleolus nucleated high nuclear/cytoplasmic ratio CD19 molecule CD4 molecule integrin alpha-M CD3 epsilon neural cell adhesion molecule 1 CD2 molecule T-cell surface glycoprotein CD8 alpha chain membrane-spanning 4-domains subfamily A member 1 T-cell surface glycoprotein CD5 CD14 molecule transferrin receptor protein 1 lymphocyte antigen 6G