A GC box containing a binding site for Sp1 was identified ( nt 4623 to 4631 ) .
a gc box containing a binding site for sp1 was identified ( nt 4623 to 4631 ) .
O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O B-protein_molecule O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O