the shuffling and dynamic env gene rearrangements that have been associated with murine retroviral leukemogenesis have also now been seen in felv-faids and hiv ( fisher et al . 1988 ; overbaugh et al . 1 t88b ; saag et al . 1988 ; tersmette et al . 1988 ) .
C0017343
env gene
C0035366
retroviral