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Functional analysis of 5' deletion constructs in transfected K562 cells and gel mobility shift localized the major phorbol ester -responsive motifs in the thromboxane receptor gene promoter to a cluster of activator protein-2 ( AP-2 ) binding consensus sites located approximately 1.8 kb 5' from the transcription initiation site .
 DNA: thromboxane receptor gene; protein: AP-2; protein: activator protein-2; DNA: activator protein-2 ( AP-2 ) binding consensus sites; DNA: 5' deletion constructs; protein: thromboxane receptor; cell line: K562 cells; DNA: transcription initiation site
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: thromboxane receptor gene; protein: AP-2; protein: activator protein-2; DNA: activator protein-2 ( AP-2 ) binding consensus sites; DNA: 5' deletion constructs; protein: thromboxane receptor; cell line: K562 cells; DNA: transcription initiation site