Hereditary diseases are difficult to cure. Antithrombin-III from transgenic goat milk and III C12 esterase inhibitor drugs from transgenic rabbit milk have been developed by recombinant DNA technology. Antithrombin-III drugs are used in the treatment of human antithrombin deficiency and III C12 esterase inhibitor drugs in the treatment of human angioedema. Efforts are underway to eradicate hereditary diseases by discovering more drugs through this technology. Each human cell contains up to 25,000 (many more are unknown) functional genes. A disorder in one of the genes can cause the disease. About 3500 genetic disorders are known in human body. This disease can be cured by recombinant DNA technology.