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These findings indicate that B29 gene expression is controlled by the complex interplay of positive and negative regulatory elements .
 DNA: negative regulatory elements; protein: B29; DNA: B29 gene
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: negative regulatory elements, B29, B29 gene 
Answer:
 DNA: negative regulatory elements; protein: B29; DNA: B29 gene