Using site-directed mutagenesis of human HSs 2 and 3 we have tested the hypothesis that these NF-E2 and GATA sites are common requirements for the formation of all LCR HSs .
using site-directed mutagenesis of human hss 2 and 3 we have tested the hypothesis that these nf-e2 and gata sites are common requirements for the formation of all lcr hss .
O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O