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L-threonine is a kind of amino acid which is essential to human body buy can not be compounded by human body. L-threonine has the functions such as anti fatigue and hastening the growing development of the human body. It also plays an important role in protecting the cell membrane, promoting phospholipid synthesis and fatty acid oxidation. Furthermore, it is the raw material for Aztreonam----a kind of high efficient and low allergic antibiotics.