What do you think might happen to tissues such as the intestinal lining if a disorder blocked mitotic cell division in all cells of the body

This is what actually happens with chemotherapy for cancer. Drugs are given which inhibit cell division. Cells such as tumour cells, which are rapidly dividing are affected most, then other dividing cells such as the epithelial lining of the gut, which nedds cell division to repair itself. The result is ulceration and bleeding.

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69 is the correct math for the amino acids

other information encoded in your genes might distinguish you from the others in the group