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Starting with a replication-incompetent molecular clone of human immunodeficiency virus type 1 , lacking all the NF-kappa B and Sp1 binding sites present in the native long terminal repeat ( LTR ), proviruses containing reconstructed LTRs with individual or combinations of NF-kappa B and Sp1 elements were generated and evaluated for their capacity to produce virus progeny following transfection-cocultivation .
 DNA: native long terminal repeat; DNA: LTR; DNA: reconstructed LTRs
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: native long terminal repeat; DNA: LTR; DNA: reconstructed LTRs