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To confirm the physiological relevance of these findings, we carried out in vivo footprinting experiments which showed that stimulation of IL-2R alpha expression correlated with occupancy of the GASd element .
 protein: IL-2R alpha; DNA: GASd element
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, GASd element 
Answer:
 protein: IL-2R alpha; DNA: GASd element