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To determine if platelet thromboxane receptors are under transcriptional control , we isolated and characterized human genomic DNA clones containing the 5' flanking region of the thromboxane receptor gene .
 DNA: 5' flanking region; protein: thromboxane receptors; DNA: human genomic DNA clones; DNA: thromboxane receptor gene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: 5' flanking region; protein: thromboxane receptors; DNA: human genomic DNA clones; DNA: thromboxane receptor gene