Figure 1 shows the expression profiles of NOD1 and NOD2 genes in a panel of breast cancer-derived cell lines, including estrogen-positive (MCF-7 and ZR-75-1) and estrogen-negative (MCF10A, MCF12A, SK-BR-3, MDA-MB-231 and Hs578T) cell lines. The gene discussed is NOD2; the disease is breast cancer.