The Rex protein of human T-cell leukemia virus type 1 is required for the nuclear export of unspliced viral mRNA and , therefore , for virus replication .
the rex protein of human t-cell leukemia virus type 1 is required for the nuclear export of unspliced viral mrna and , therefore , for virus replication .
O B-protein_molecule O O O B-virus I-virus I-virus I-virus I-virus O O O O O O O B-RNA_family_or_group I-RNA_family_or_group I-RNA_family_or_group O O O O O O O O