9556
Interleukin 2 and T cell antigen receptor signals converge upon serine 727 .
 protein: Interleukin 2; protein: T cell antigen receptor
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: Interleukin 2, T cell antigen receptor 
Answer:
 protein: Interleukin 2; protein: T cell antigen receptor