Scientists in Argentina report that they have created four cloned and genetically modified calves that will be able to produce human insulin in their milk once they reach maturity. The animals’ milk will be purified and refined to extract the insulin. The researchers believe the insulin produced by these animals could be on the market in a few years and offer a cheaper source of insulin than currently available. It’s estimated that just 25 of these insulin-producing cows would be able to supply Argentina’s 1.5 million diabetics. According to the American Diabetes Association, there are currently about 20.8 million diabetics in the United States.