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We analyzed the activity of the enhancer , the promoter and the silencer of the human CD4 gene during T cell development using transgenic mice .
 DNA: promoter; DNA: human CD4 gene; DNA: CD4 gene; DNA: silencer; DNA: enhancer
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: promoter, human CD4 gene, CD4 gene, silencer, enhancer 
Answer:
 DNA: promoter; DNA: human CD4 gene; DNA: CD4 gene; DNA: silencer; DNA: enhancer