7235
The costimulatory molecule CD28 has a restricted tissue distribution and is expressed on T cells and some plasmacytoma cells .
 ( protein: CD28, None) , ( cell type: T cells, None) , ( protein: costimulatory molecule, None) , ( cell type: plasmacytoma cells, 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: CD28, None) , ( cell type: T cells, None) , ( protein: costimulatory molecule, None) , ( cell type: plasmacytoma cells, None) 