Transgenic approaches to reducing mycotoxins in feed
Mycotoxins are manufactured by fungi thanks to their genes, and fungi usually have around 10 000 genes.
Fermentation of barley with yeast is a way to produce ethanol;

A by-product of this is called "distillers dried grains with solubles", and used in animal feed. Unfortunately this often contains DON, a mycotoxin produced by the Fusarium fungi that contaminates cereals.
By using a transgenic yeast, which expresses trichothecene 3-O-acetyltransferases,  this DON is converted into 3 acetyldeoxynivalenol, less toxic than DON.
This demonstrates that transgenic production of cereals might become a key method for reducing their contamination by mycotoxins.