2171
In contrast to PMA , RA did not induce any CAT activity in these cells, thus suggesting that the RA -induced changes in the expression of those genes described above were not dependent on the AP-1 enhancer activity .
 protein: AP-1; DNA: AP-1 enhancer; protein: CAT
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: AP-1, AP-1 enhancer, CAT 
Answer:
 protein: AP-1; DNA: AP-1 enhancer; protein: CAT