Why Cockroaches and Insects are Resistant to Radiation

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The primary reason cockroaches and many types of insects are so resistant to ionizing radiation is that their cells don’t divide that much between molting cycles.  Cells are most susceptible to damage by ionizing radiation when they are dividing.  Given that a typical cockroach only molts about once a week and its cells only divide around a 48 hour period during that week, about 3/4 of the cockroaches exposed would not be particularly susceptible to damage by ionizing radiation, at least, relative to those whose cells were currently dividing.

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