tokens: It was found that the propagation of the Tat mutants containing wild-type LTRs was less efficient than that of the LTR-modified Tat mutants .
folded_tokens: it was found that the propagation of the tat mutants containing wild-type ltrs was less efficient than that of the ltr-modified tat mutants .
labels: O O O O O O O O B-protein_molecule O O B-DNA_family_or_group I-DNA_family_or_group O O O O O O O B-protein_family_or_group B-protein_molecule O O