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REV LTRs work efficiently in human lymphoid cells , and are viable alternatives to promoters commonly used for expression of cloned genes .
 DNA: cloned genes; DNA: REV LTRs; DNA: promoters; cell type: human lymphoid cells
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: cloned genes; DNA: REV LTRs; DNA: promoters; cell type: human lymphoid cells