tokens: Here , we show that the Duffy antigen/chemokine receptor gene ( DARC ) is composed of a single exon and that most Duffy-negative blacks carry a silent FY*B allele with a single T to C substitution at nucleotide -46 .
folded_tokens: here , we show that the duffy antigen/chemokine receptor gene ( darc ) is composed of a single exon and that most duffy-negative blacks carry a silent fy*b allele with a single t to c substitution at nucleotide -46 .
labels: O O O O O O B-protein_molecule I-protein_molecule I-protein_molecule O O B-DNA_domain_or_region O O O O O O B-DNA_family_or_group O O O B-multi_cell I-multi_cell O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O B-other_name I-other_name I-other_name I-other_name O B-nucleotide I-nucleotide O