7673
HLA class I -mediated inactivation of Rb can be inhibited specifically by neutralizing Abs to basic fibroblast growth factor ( bFGF ), suggesting a role for FGF receptors in the signaling process.
 ( protein: Rb, None) , ( protein: FGF receptors, None) , ( protein: neutralizing Abs, None) , ( protein: HLA class I, None) , ( protein: bFGF, None) , ( protein: basic fibroblast growth factor, 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: Rb, None) , ( protein: FGF receptors, None) , ( protein: neutralizing Abs, None) , ( protein: HLA class I, None) , ( protein: bFGF, None) , ( protein: basic fibroblast growth factor, None) 