11019
The presence of this protein results in a markedly reduced thymic cellularity , although the distribution of the remaining cells is normal based on evaluation of the CD4 and CD8 cell surface antigens that are used to gauge T cell development .
 ( protein: cell surface antigens, None) , ( protein: CD8, None) , ( protein: CD4, 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: cell surface antigens, None) , ( protein: CD8, None) , ( protein: CD4, None) 