XRCC6 and breast cancer: Figure 2 presents Ku70, Ku80 AP-2α, AP-2γ, and p185-erbB2 protein levels in the cytoplasmic and the nuclear fractions of breast cancer (BT-474, SKBR3, ZR-75.1, MCF-7, MDA-MB-231), colon cancer (HCT-116) and hepatoma (HepG2) cell lines.