Genetically-modified (GM) tomatoes, carrying thaumatin gene encoding sweet-tasting protein may be a component of diet with high sensory values, constituting a valuable source of nutrients and substances with a health-promoting role. Good utilization and a lack of the effect on animal growth, value of hematological parameters, concentration of immunoglobulins and most of chemical blood parameters of laboratory rats were demonstrated in the nutritional studies on fruits of tomato GM plants. The biological response of the rats receiving GMO or its isogenic equivalent in the diet was recognized as similar. However, the unfavourable effect of the diets containing addition of tomatoes with the recombined thaumatin on the degree of oxidative degradation of DNA of rats liver was recorded. At the same time, the discussed dietary component had no effect on values of the remaining parameters of the oxidative status of tissue of the above mentioned organ and its histological image
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