transgene Transgene TetO-EGFR<L858R> EGFR<L858R> http://identifiers.org/mgd/MGI:3690073 EGFR<L858R>|L858R57|TetO-EGFR<L858R> MGI:3690073 Tg(tetO-EGFR*L858R)57Hev transgene insertion 57, Harold E Varmus O L858R57