[A virus produced by human embryonic cells infected with Moloney murine sarcoma virus]

Human embryonic cell cultures, infected with the Mouse sarcoma virus, complex (Moloney isolate), produced a virus that specifically transformed mink lung cells. The non-transforming helper virus could infect Mouse cells as well as a wide range of other mammalian cells. These observations could suggest the presence of either several viruses in the virus stock and/or stable recombinants.