HIV-1 infection resulted in constitutive , low-level expression of type 1 interferon ( IFN ) at the mRNA level .
hiv-1 infection resulted in constitutive , low-level expression of type 1 interferon ( ifn ) at the mrna level .
B-virus O O O O O B-other_name I-other_name O B-protein_molecule I-protein_molecule I-protein_molecule O B-protein_family_or_group O O O B-other_name I-other_name O