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The grey shag mushroom produces copsin, which is more stable than other antibiotics.

Horse dung has scientists on scent of antibiotic success

Unlike other antibiotics, the compound is a protein 
and offers a different mode of action

European biologists have discovered a bacteria-killing compound in common mushrooms that grow in horse dung. Unusually for an antibiotic, copsin is a protein; but laboratory trials showed it to have the same effect on bacteria as traditional antibiotics. The scientific community hopes to be able to develop a new range of antibiotics to replace those