Thus , despite its essential role for releasing an elongation block , Tat is not otherwise absolutely required for synthesis of full-length HIV transcripts and assembly of virus particles .
thus , despite its essential role for releasing an elongation block , tat is not otherwise absolutely required for synthesis of full-length hiv transcripts and assembly of virus particles .
O O O O O O O O O B-protein_complex I-protein_complex O B-protein_molecule O 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 B-virus I-virus O