Expression levels of cyclin G2 mRNA were also correlated to the differentiation status of gastric cancer cell lines, with the lowest mRNA cyclin G2 expression occurring in the poorly differentiated AGS cells and the highest cyclin G2 expression occurring in the well-differentiated immortalized human gastric epithelial mucosa cell line GES-1 (Fig. 1d). The gene discussed is CCNG2; the disease is gastric cancer.