O B7-1 transgene B.B7-1|B7-1T Tg|B7-1 transgene|T.B7-1 http://identifiers.org/mgd/MGI:3656396 B7-1T Tg Transgene transgene B.B7-1 Tg(Igh-6-Cd80)1Gjf MGI:3656396 transgene insertion 1, Gordon J Freeman T.B7-1