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The Stranger in the Mirror: Dissociation – The Hidden Epidemic, written by Marlene Steinberg and Maxine Schnall is a book which goes through case files of individuals with dissociative identity disorder, who have suffered traumatizing happenings and how they have employed dissociation as a defense mechanism to detach themselves from the emotional stimuli which the victims endured.
According to two researchers, Nesse and Williams, diarrhea may function as an evolved expulsion defense mechanism.
The classical example of an antibiotic discovered as a defense mechanism against another microbe is the discovery of penicillin in bacterial cultures contaminated by Penicillium fungi in 1928.
The island's super-intelligent defense mechanism, however, proves to be too much for Lupin, Jigen, and Goemon to handle by themselves.
The rat is known to deliberately smear these hairs with poison from the bark of the Acokanthera schimperi, on which it chews, thus creating a defense mechanism that can sicken or even kill predators which attempt to bite it.
This theory was put forward as a defense mechanism for the LGM-118 Peacekeeper missile deployment, reasoning that multiple detonations would be required to knock out an entire battery of missiles if sufficiently protected.