13701
We also detected abnormally low levels of the signaling molecules T-cell receptor (TCR)-zeta , ZAP-70 and p56lck in 4 of 14 breast cancer patients , i.e., defects in T-cell signaling molecules .
 ( protein: signaling molecules, None) , ( protein: T-cell signaling molecules, None) , ( protein: signaling molecules, None) , ( protein: p56lck, None) , ( protein: ZAP-70, None) , ( protein: T-cell receptor (TCR)-zeta, 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: signaling molecules, None) , ( protein: T-cell signaling molecules, None) , ( protein: signaling molecules, None) , ( protein: p56lck, None) , ( protein: ZAP-70, None) , ( protein: T-cell receptor (TCR)-zeta, None) 