14786
The frequency of the cells which expressed beta- and gamma- globin genes in the two cell populations was measured by immunofluorescence with beta- and gamma- specific antibodies .
 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