How do gene interactions affect gene expression?

Gene–environment interaction or genotype–environment is when two different genotypes respond to environmental variation in different ways. A norm of reaction is a graph that shows the relationship between genes and environmental factors when phenotypic differences are continuous.

While still in the experimental stages, xenotransplantation is a potentially life-saving option for people with such ailments as severe heart disease and kidney failure. Preliminary data from experiments using transplanted pig cells in patients with diabetes and Parkinson's disease are encouraging.

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