Word: toxin
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...experimental treatment, called oral immunotherapy, aims to desensitize the body to allergens like peanuts by training the immune system to make peace with them. Most food allergies - whether to peanuts, eggs, milk or shellfish - are a result of the immune system misidentifying a food as a dangerous toxin. The body wages war with the invader, and the by-product is an allergic reaction - anything from a minor itch or swelling to a severe asthma attack, which in extremely rare cases and if left untreated can lead to death. Immunotherapy is designed to build up the body's tolerance to such...
...source for the 1956 Invasion of... movie version and its three remakes. Alex Garland's script for 28 Days Later..., in 2002, blamed the plague on a virus injected into monkeys. In The Happening, two summers ago, M. Night Shyamalan reprised Romero's Crazies concept, except that the toxin is transmitted through the air, not the water, and turns its victims suicidal, not homicidal...
Shrews, along with platypuses, are among the few venomous mammals, and they produce a toxin in modified salivary glands that enters their prey’s circulatory system when they bite, Hoekstra explained...
...toxin is an enzyme, a type of protein that accelerates the rate of chemical reactions by bringing reactants together in the enzyme’s active site...
When lead author Yael T. Aminetzach, a postdoctoral fellow in OEB, compared the toxin to a nontoxic counterpart, she found that the molecular changes occurred in active site of the enzyme. While the toxins from the lizard and the shrew are distinct, the overall trend of changes turned out to be the same...