The amino acid threonine is considered to be an essential amino acid as it is required to be present in dietary sources since the body cannot synthesize it on its own. The amino acid threonine is an important compound for the production of purines - these are compounds that break down uric acid, which itself is a by-product of protein digestion in the human body. Uric acid accumulation in the body can result in disorders such as gout, disorders like a different form of arthritis, and related health problems in different individuals. The presence of sufficient threonine levels in the body is also essential for the synthesis of the non-essential amino acid glycine in the human body. The amino acid threonine is present mainly in the cardiac tissues of the heart, in skeletal muscles and in the tissues making up the central nervous system. The formation of the proteins elastin and collagen are dependant on the presence of high levels of threonine. Lipotropic actions and the functioning of the liver are also aided by the combined action of the amino acids threonine, methionine and the aspartic acid. The prevention of accumulated fatty tissues in the liver is also dependent on the presence of threonine. The production of anti-bodies in the body is also boosted by threonine; this action in its turn promotes the functioning of the immune system. The amino acid threonine is essential for proper utilization of dietary proteins, it is also necessary for the maintenance of an appropriate protein balance in the tissues of the body.