tokens: Mobility shift assays with various mutant probes and B cell nuclear extracts demonstrated that the core sequence TAAT was essential for binding to this site .
folded_tokens: mobility shift assays with various mutant probes and b cell nuclear extracts demonstrated that the core sequence taat was essential for binding to this site .
labels: O O O O O O O O O O O O O O O O O O O O O O O O O O