Digger wasps paralyze cockroach prey by injecting venom into their head and thorax via their stings. In an experiment, "hot" wasps were produced, whose venom components were radioactively labeled. Cockroaches were divided into two groups: one group was stung by "hot" wasps, which the other was artificially injected in the head and thorax capsules with the same amount of radioactive venom. Examination of these cockroaches revealed high radioactivity in the head and thoracic ganglia compared with the rest of the head and thorax in stung cockroaches but only low levels in the ganglia as compared to other tissue in injected cock-roaches. This experiment demonstrates that
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