8602
Recent molecular evidence points to transient and/or stage-specific expression of delta- and kappa- opioid receptors by thymic and peripheral T lymphocytes .
 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