2508
Although two cases expressed CD4 , no case expressed CD2 , CD3 , or CD8 and no case showed clonal rearrangement of genes encoding the T-cell receptor ( TCR beta , gamma , delta ).
 CD3, T-cell receptor, CD2, CD4, CD8
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 CD3, T-cell receptor, CD2, CD4, CD8