increased nucleated erythrocyte cell number MP:0009395 MPheno.ontology increased immature RBC cell number increased immature erythrocyte cell number increased immature red blood cell number increased nucleated RBC cell number increased nucleated red blood cell number persistence of embryonic erythrocytes persistence of primitive erythrocytes presence of increased numbers of nucleated red blood cells at stages when these cells are normally replaced by mature, enucleated, red blood cells abnormal nucleated erythrocyte cell number