MYC and neoplasm: In all mouse tumor groups, the peak of this gain was located at (for Brca2Δ/Δ;p53Δ/Δ and p53Δ/Δ tumors) or near (for Brca1Δ/Δ;p53Δ/Δ tumors) the region containing the MYC oncogene at 128.8 Mb.