tokens: RNA was extracted by phenol/chloroform and c-fos expression was analyzed by PCR assisted mRNA assay .
folded_tokens: rna was extracted by phenol/chloroform and c-fos expression was analyzed by pcr assisted mrna assay .
labels: B-RNA_family_or_group O O O B-other_organic_compound O B-DNA_domain_or_region O O O O B-other_name I-other_name I-other_name I-other_name O