tokens: In a heterologous transcriptional system in which the upstream regions of oIFNtau were inserted in front of simian virus 40 ( SV40 ) promoter , the regions between bases -654 and -555 were determined as being the enhancer region required for oIFNtau-SV40-CAT transactivation .
folded_tokens: in a heterologous transcriptional system in which the upstream region of oifntau be insert in front of simian virus 40 ( sv40 ) promoter , the region between basis -654 and -555 be determine as be the enhancer region require for oifntau-sv40-cat transactivation .