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Splitting the HS2 enhancer between two tandem Ap1 sites abolishes the synthesis of a group of long enhancer transcripts and results in loss of enhancer function and transcriptional silencing of the cis-linked CAT gene .
 DNA: cis-linked CAT gene; DNA: HS2 enhancer; RNA: long enhancer transcripts; DNA: tandem Ap1 sites
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: cis-linked CAT gene; DNA: HS2 enhancer; RNA: long enhancer transcripts; DNA: tandem Ap1 sites