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The exon-intron structure of the 5' portion of the thromboxane receptor gene was determined initially by comparing the nucleotide sequence of the 5' flanking genomic clone with that of a novel human uterine thromboxane receptor cDNA that extended the mRNA 141 bp further upstream than the previously identified human placental cDNA .
 protein: thromboxane receptor; DNA: 5' portion; DNA: 141 bp further upstream; protein: thromboxane receptor; DNA: previously identified human placental cDNA; DNA: thromboxane receptor gene; DNA: exon-intron structure; DNA: novel human uterine thromboxane receptor cDNA; DNA: 5' flanking genomic clone; DNA: nucleotide sequence; RNA: mRNA
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:
 protein: thromboxane receptor; DNA: 5' portion; DNA: 141 bp further upstream; protein: thromboxane receptor; DNA: previously identified human placental cDNA; DNA: thromboxane receptor gene; DNA: exon-intron structure; DNA: novel human uterine thromboxane receptor cDNA; DNA: 5' flanking genomic clone; DNA: nucleotide sequence; RNA: mRNA