Genetic factors - (a parent, 30%) (both parents, 50%) (parents without disease, 8%): a lot of psoriasis and related genes, each of which the role of genes relatively minor, but its effect is cumulative, when the cumulative effects of more than a certain value, in case of certain external factors, or in vivo changes in certain factors, ie disease. Psoriasis affects more than by genetic factors and other factors.
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