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Overall goal of our research is to gain better knowledge of gene-gene and gene-environment interactions in common cardiovascular conditions in humans. We have been modifying mouse genome in such a way that resulting mice can model quantitative variations of a specific gene product that occur in human population. With these mice, we explore causes, mechanisms, and nutritional treatments of cardiovascular complications resulted from common conditions such as diabetes, lung infections, and pregnancy-associated hypertension. Current focus is on the oxidative stress and effects of vitamin B12 as antioxidant and beyond.