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The interleukin 2 receptor alpha-chain ( IL-2R alpha ) gene is a key regulator of lymphocyte proliferation .
 protein: IL-2R alpha; DNA: interleukin 2 receptor alpha-chain ( IL-2R alpha ) gene; protein: interleukin 2 receptor alpha-chain
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-2R alpha, interleukin 2 receptor alpha-chain ( IL-2R alpha ) gene, interleukin 2 receptor alpha-chain 
Answer:
 protein: IL-2R alpha; DNA: interleukin 2 receptor alpha-chain ( IL-2R alpha ) gene; protein: interleukin 2 receptor alpha-chain