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To characterize the human elk-1 promoter , we mapped the transcriptional start site and isolated elk-1 -specific genomic phage clones that contained extensive upstream and downstream sequences .
 DNA: human elk-1 promoter; cell line: elk-1 -specific genomic phage clones; DNA: elk-1; DNA: elk-1; DNA: transcriptional start site
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: human elk-1 promoter, elk-1 -specific genomic phage clones, elk-1, elk-1, transcriptional start site 
Answer:
 DNA: human elk-1 promoter; cell line: elk-1 -specific genomic phage clones; DNA: elk-1; DNA: elk-1; DNA: transcriptional start site