The codons that code for the amino acid threonine are ACT, ACC, ACA and ACG. Threonine is an essential amino acid i.e. it is vital for a person's health, but it cannot be synthesized by the body therefore it has to be obtained from diet. It supports cardiovascular, liver, central nervous and immune system functioning. It also aids in building up strong bones and tooth enamel and speeds up healing process in wounds following trauma or surgery by boosting the immune system.