The open reading frames in the 3' long terminal repeats of several mouse mammary tumor virus integrants encode V beta 3-specific superantigens.
Pullen AM, Choi Y, Kushnir E, Kappler J, Marrack P. The open reading frames in the 3' long terminal repeats of several mouse mammary tumor virus integrants encode V beta 3-specific superantigens. J Exp Med. 1992 Jan 01; 175(1):41-7.