838
Mutagenesis indicates that the 21 bp repeats can be subdivided into three motifs, A , B and C , each of which influences the level of tax activation .
 DNA: B; DNA: 21 bp repeats; DNA: A; protein: tax; DNA: C
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: B; DNA: 21 bp repeats; DNA: A; protein: tax; DNA: C