Masson trichrome staining micrographs showing transverse sections of left ventricular myocardium (× 400, bar = 50 μm). Comparisons of the fibrosis fraction (left bar graph) between WT (grey bars) and DGKζ-TG (black bars) mice. The fibrosis fraction was obtained by calculating the ratio of Masson trichrome stained connective tissue area (stained blue) to total myocardial area. Data were calculated by averaging the measurements of 10 fields from each sections. Data were obtained from 8 mice for each group. *P < 0.01 vs. WT control, †P < 0.01 vs. WT STZ, §P < 0.01 vs. DGKζ-TG control.