tokens: The promoter of the rat pgp2 / mdr1b gene has a GC rich region ( pgp2GC ) that is highly conserved in mdr genes and contains an consensus Sp1 site .
folded_tokens: the promoter of the rat pgp2 / mdr1b gene have a gc rich region ( pgp2gc ) that be highly conserve in mdr gene and contain a consensus sp1 site .