Prions serve as important source of variation in nature

Special proteins known as prions, which are perhaps best known as the agents of mad cow and other neurodegenerative diseases, can also serve as an important source of beneficial variation in nature, confirms a new study in the April 3rd issue of the journal Cell, a Cell Press publication. After an extensive search through the genome of yeast for proteins with prion-like character, the researchers found two dozen prion-forming proteins, most of which had never been seen before.

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