8793
Seven of 15 fibroblast lines were heterozygous for polymorphic alleles , and the expression patterns were variable, i.e., equal, unequal or monoallelic paternal expression in three, two and two cases, respectively.
 ( DNA: polymorphic alleles, None) , ( cell line: fibroblast lines, 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: polymorphic alleles, None) , ( cell line: fibroblast lines, None) 