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Human peripheral blood lymphocytes were observed to contain several IL-2 -inducible DNA binding activities .
 protein: IL-2; cell type: Human peripheral blood 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, Human peripheral blood lymphocytes 
Answer:
 protein: IL-2; cell type: Human peripheral blood lymphocytes