The most lethal mushroom in the world is the death cap mushroom, and now scientists have discovered a possible antidote from an unlikely source: a fluorescent dye. Called indocyanine green (ICG), the dye is commonly used in medical imaging to help assess the functionality of the heart and liver, but an international team of scientists have found that it also stops alpha-amanitin (AMA), the death cap mushroom's primary toxin, dead in its tracks, according to a study published May 16 in the journal Nature Communications . So far, this antidote has worked in human cells, mini models of the liver…