Now I could make a back-of-the-envelope calculation of how many milligrams of neurotoxin were needed to bind half of the receptors in a grown man. But in some cases the chemical company had made the calculation already by listing the 'LD50', the lethal dose for mice or rats. So I could calculate the lethal dose for Cooper by scaling the rat dose to a seventy killogram man. Rob McGregor would probably agree that Cooper would weigh in at about 280 rats.
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