tokens: Co-immunoprecipitation and DNA affinity chromatography prove that Sp1 heterodimerizes with ZBP-89 when bound to the silencer element to yield a DNA protein complex whose mobility is indistinguishable from that displayed by HeLa nuclear extract in band shift assays .
folded_tokens: co-immunoprecipitation and dna affinity chromatography prove that sp1 heterodimerize with zbp-89 when bind to the silencer element to yield a dna protein complex whose mobility be indistinguishable from that display by helum nuclear extract in band shift assay .