the complete nucleotide sequence ( 8173 base pairs ) of a molecular clone of the prototype saids virus isolate , srv-1 , reveals a typical retrovirus structure with long terminal repeats ( 346 base pairs ) and open reading frames for the gag ( 663 codons ) , pol ( 867 codons ) , and env ( 605 codons ) genes .
C0035366
retrovirus
C0017343
env