8124
Fetal thymocytes infected with adenovirus containing mut-I kappa B were found to develop normally until the CD44 -CD25+, CD4 - CD8 - double-negative stage , while production of more mature double-positive and single-positive populations was strongly decreased.
 ( protein: CD8, None) , ( protein: CD44, None) , ( cell type: Fetal thymocytes, None) , ( protein: CD4, None) , ( protein: mut-I kappa B, 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: CD8, None) , ( protein: CD44, None) , ( cell type: Fetal thymocytes, None) , ( protein: CD4, None) , ( protein: mut-I kappa B, None) 