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The major putative downstream site for E2F , located in the first exon , serves as a target for E2F-1/DP1 complex binding in vitro.
 DNA: major putative downstream site; protein: E2F; protein: E2F-1/DP1 complex; DNA: first exon
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: major putative downstream site, E2F, E2F-1/DP1 complex, first exon 
Answer:
 DNA: major putative downstream site; protein: E2F; protein: E2F-1/DP1 complex; DNA: first exon