Five clone calves in Wisconsin have been born with 0.1 percent human DNA. They are expected to produce a human protein, C-1 Esterase Inhibitor, in their milk to treat humans suffering from angioedema.

Infigen, a biotech company in DeForest, Wisconsin, is cloning cows with human DNA to produce products such as human collagen, human fibrinogen (used to treat wounds), and human factor VIII, used for blood clotting.

The company also plans genetically modified pigs to produce livers, kidneys, hearts and pancreases for ailing patients.