[Biological properties of the Rous sarcoma virus isolated from transformed hamster cells].

Rous sarcoma virus (RSV) isolated from virogenic transformed hamster cells differed from the original Schmidt-Ruppin strain used to inoculate hamster embryo fibroblasts in the capacity to effectively transform mammalian cells, to multiply in these cells, in the reduced reproductive activity in chicken cells. These altered properties were relatively stable since they were retained in the first virus passages in chickens.