1011
In this study we investigated the mechanisms whereby anti-CD2 antibodies stimulate viral production .
 protein: anti-CD2 antibodies
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: anti-CD2 antibodies