Transgene Tg(MMTV-HRAS)1Led http://identifiers.org/mgd/MGI:2653621 transgene insertion SH1, Philip Leder MMTV-v-Ha-ras|Tg(MMTV-HRAS)1Led|TG.SH|MMTV/v-Ha-ras|MMTV-H-Ras MMTV-v-Ha-ras MMTV/v-Ha-ras Tg(MMTV-vHaras)SH1Led MGI:2653621 TG.SH O MMTV-H-Ras transgene