It was believed that the genes in our body cells represented such a system : a system of 100000 genes, that switch each other on and off. However, as stated earlier, the human genome turned out to consist not of 100000, but of about 30000 to 40000 genes. Of course the choice of criteria for recognizing something (i.e. some substructure) within the genome as a gene, could influence this number (of genes).
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