tokens: Of note was the associated emergence of second-site LTR revertants which involved an alteration of the TATA box .
folded_tokens: of note was the associated emergence of second-site ltr revertants which involved an alteration of the tata box .
labels: O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O