This observation raises the possibility that vpr acts to facilitate the early steps of infection before de novo viral protein synthesis occurs .
this observation raises the possibility that vpr acts to facilitate the early steps of infection before de novo viral protein synthesis occurs .
O O O O O O B-DNA_domain_or_region O O O O O O O B-other_name O B-other_name I-other_name I-other_name I-other_name I-other_name O O