2197150 SV40T simian virus 40 large T antigen 24 3854659 SV40 T-ag Simian virus 40 T-antigen 8 3854654 SV40 Tag Simian Virus 40 T-antigen 7 3854640 SV40Tag Simian Virus 40 T antigen 4 3854644 SV 40 TAg simian virus 40 T antigen 3 1950832 SV40-T antigen simian virus 40 T antigen 1 3195480 SV40ts simian virus 40 T antigen 1