8655
We developed mice transgenic for human CSF-1R because mouse CSF-1 cannot activate human CSF-1R .
 ( protein: CSF-1, None) , ( protein: CSF-1R, None) , ( protein: CSF-1R, 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:
 ( protein: CSF-1, None) , ( protein: CSF-1R, None) , ( protein: CSF-1R, None) 