tokens: When purified PRDII and tetrahexamer binding proteins were added to the induced extract , a 4-fold increase in transcription was observed .
folded_tokens: when purified prdii and tetrahexamer binding proteins were added to the induced extract , a 4-fold increase in transcription was observed .
labels: O O O O O O O O O O O O O O O O O O B-other_name O O O