 Acute leukemias of ambiguous lineage ( also known as mixed phenotype or biphenotypic acute leukemia ) occur when the leukemic cells can not be classified as either myeloid or lymphoid cells , or where both types of cells are present . 
 Acute leukemias of ambiguous lineage ( also known as mixed phenotype or biphenotypic acute leukemia ) occur when the leukemic cells can not be classified as either myeloid or lymphoid cells , or where both types of cells <a href='drop_aux' title='1'><mark>are</mark></a>present . 
Acute leukemias of ambiguous lineage ( also known as mixed phenotype or biphenotypic acute leukemia ) occur when the leukemic cells can not be classified as either myeloid or lymphoid cells , or where both types of cells present .