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We examined the transcriptional activity of ring X chromosomes lacking XIST expression (XISTE-), from three females with severe phenotypes.
 DNA: XIST; DNA: X chromosomes
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: XIST, X chromosomes 
Answer:
 DNA: XIST; DNA: X chromosomes