tokens: NB-506 completely inhibits the capacity of topoisomerase I to phosphorylate , in vitro , the human splicing factor 2 / alternative splicing factor ( SF2 / ASF ) .
folded_tokens: nb-506 completely inhibit the capacity of topoisomerase I to phosphorylate , in vitro , the human splicing factor 2 / alternative splicing factor ( sf2 / ASF ) .