 This increase in lysine content is attributed to an "opaque-2" mutation that reduced the transcription of lysine lacking zein related seed storage proteins and, as a result, increased the abundance of other proteins that are rich in lysine.Commonly, to overcome the limiting abundance of lysine in livestock feed, industrially produced lysine is added.The industrial process includes the fermentative culturing of "Corynebacterium glutamicum" and the subsequent purification of lysine.