Biomanufacturing means growing living cells (bacterial, yeast, and animal cells) in large tanks and inducing them to produce a protein that can be used in the making of many different products, such as medicines, stem cells, biofuels, biomaterials, and biologically created chemicals. That protein must then be separated from other cellular components, and purified using techniques that exploit its properties to isolate it from other cellular proteins. Technicians then use analytical techniques to prove the purity of the isolated proteins.