SV40 T-antigenSV40 T-antigen is a tumor-inducing antigen, a protein produced by simian vacuolating virus 40.SV40 T-antigen may refer to: SV40 small T-antigen SV40 large T-antigenRelated antigensSV40 is a polyomavirus, and similar proteins in polyomaviruses in general are known as: Small T-antigen Large T-antigen