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Like other cytokines, IL-12 mediates its biologic activity through high-affinity receptors expressed on responsive cells .
 cell type: responsive cells; protein: IL-12
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: responsive cells, IL-12 
Answer:
 cell type: responsive cells; protein: IL-12