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In turn, secreted IL-2 serves to stimulate the proliferation and differentiation of T lymphocytes .
 protein: IL-2; cell type: T lymphocytes
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: IL-2, T lymphocytes 
Answer:
 protein: IL-2; cell type: T lymphocytes