437
Two types of helper T cell (Th) clones ( Th1 and Th2 ) are defined on the basis of different patterns of cytokine ( lymphokine ) secretion.
 protein: lymphokine; cell line: helper T cell (Th) clones; protein: cytokine; cell line: Th2; cell line: Th1
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: lymphokine; cell line: helper T cell (Th) clones; protein: cytokine; cell line: Th2; cell line: Th1