to determine whether the f-mulv gag and pol genes also possess sequences that affect leukemogenicity , we generated recombinant viruses between the f-mulv gag and pol genes and two other murine retroviruses , amphotrophic clone 4070 ( ampho ) and friend mink cell focus-inducing virus ( fr-mcf ) .
C0017360
pol genes
C0035366
retroviruses