Many BlueSens users use yeasts as production organisms. Yeasts are well researched, inexpensive, relatively easy to manipulate and are considered ideal systems for the production of foreign proteins. Apart from the production of bread, the oldest use of yeasts is probably the production of alcohol in the production of wine, beer or spirits, in which sugar is converted into ethanol and CO₂. However, yeasts are also used in the production of biopharmaceuticals. They are used to produce therapeutic proteins, vaccines or enzymes. As eukaryotes, they are able to glycosylate proteins and secrete the resulting glycoproteins into the surrounding culture medium. The proteins produced in yeasts are therefore very similar to animal or human proteins, which is essential for the tolerability of drugs. Yeasts are also often used in the biosynthesis of chemicals or the production of biofuels.