abnormal erythroid progenitor cell morphology decreased erythroid progenitor cell number MP:0008973 MPheno.ontology decreased BFU-E number decreased CFU-E number decreased blast forming unit erythroid number decreased burst forming unit erythroid number decreased colony forming unit erythroid number decreased erythroid precursors decreased erythroid stem cell number reduced BFU-E number reduced CFU-E number reduced blast forming unit erythroid number reduced burst forming unit erythroid number reduced colony forming unit erythroid number reduced erythroid precursors reduced erythroid stem cell number reduced numbers of progenitors of the erythrocyte lineage