tokens: Maximal induction of the c-fos gene was followed by that for the fos-B gene .
folded_tokens: maximal induction of the c-fos gene was followed by that for the fos-b gene .
labels: O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O