138
The activity of IL-1 was expressed as its ability to stimulate 3H-TdR incorporation in the thymocytes of C57 mice.
 protein: 3H-TdR; protein: IL-1; cell type: thymocytes
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: 3H-TdR; protein: IL-1; cell type: thymocytes