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A peptide (15 aa) isolated from the brains of rats that were trained to fear the dark. The claim that this dark-aversion was transferable to naive animals has been considered rather improbable, although there does seem to be some positive experimental data for pharmacological effects of the peptide.

http://www.asa3.org/archive/evolution/199811/0003.html A discussion of the controversy over scotophobin.

Subjects: Medicine and Health — Chemistry.

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