AY046510 35764 1 103 terminal repeat AY046510 35764 193 354 packaging site AY046510 35764 1264 4725 iNOS AY046510 35764 4932 4936 SV40 early polyadenylation signal AY046510 35764 4961 4965 SV40 polyadenylation signal AY046510 35764 35661 35764 terminal repeat