tokens: We have employed an optimized cell-free RNA transcription assay to analyze transcription activity of XP-B and XP-D .
folded_tokens: we have employed an optimized cell-free rna transcription assay to analyze transcription activity of xp-b and xp-d .
labels: O O O O O B-other_name I-other_name I-other_name I-other_name O O O O O B-other_name O B-other_name O