6000
In this syndrome, tumorigenesis classically initiates from an inherited mutation in one allele followed by somatic deletion of the normal allele .
 ( DNA: allele, None) , ( DNA: normal 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) , ( DNA: normal allele, None) 