2191
Aims of the study were to (1) assess the potential role of the expression of these genes in the maintenance and expansion of the neoplastic clones and (2) search for constitutional losses or rearrangements of one allele followed by a deletion of the second allele of the same genes in the leukemic cells .
 ( DNA: allele, None) , ( cell type: leukemic cells, None) , ( cell line: neoplastic clones, None) , ( DNA: allele, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: allele, None) , ( cell type: leukemic cells, None) , ( cell line: neoplastic clones, None) , ( DNA: allele, None) 