6040
However, a minority of genes are semi-dominant , as heterozygous loss-of-function mutation in these genes leads to phenotypic abnormalities .
 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:
 None