tokens: And , most importantly , reconstitution of a consensus CRE , within the 21-bp enhancers increases binding of CREB / ATF proteins but abrogates basal repression of LTR directed transcription in vitro .
folded_tokens: and , most importantly , reconstitution of a consensus cre , within the 21-bp enhancer increase binding of creb / atf protein but abrogate basal repression of ltr direct transcription in vitro .