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After the DNA fragment containing the CAG repeats is amplified by the polymerase chain reaction , a primer extension is carried out; the extension of the end-labelled reverse primer adjacent to 3' end of CAG repeats stops at the first T after CAG repeats with the incorporation of dideoxy ATP in the reaction mixture.
 DNA: CAG repeats; DNA: end-labelled reverse primer; DNA: CAG repeats; DNA: CAG repeats; DNA: DNA fragment; DNA: 3' end
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: CAG repeats; DNA: end-labelled reverse primer; DNA: CAG repeats; DNA: CAG repeats; DNA: DNA fragment; DNA: 3' end