Task: Named Entity Recognition
Input (English):  Although both isomers were expressed in human erythroid - megakaryocytic cell lines , megakaryocytic maturation with loss of erythroid phenotype induced by phorbol 12 - myristate 13 - acetate ( PMA ) resulted in exclusive downregulation of fNF - E2 , suggesting that fNF - E2 promoter is more erythroid specific .
Output (English): fNF - E2