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Expression of E-cyclins in mouse breast tumors. RNA was isolated from mammary glands of nontransgenic, wild-type mice (WT MG), from breast tumors arising in transgenic MMTV-v-Ha-Ras female mice (MMTV/Ras T), or from breast tumors arising in transgenic MMTV-c-Myc female mice (MMTV/Myc T). Northern blots of representative samples were hybridized with probes specific for cyclin E1 or E2. (Bottom) Ethidium bromide-stained gel.
