↑Bhagavan, N. V.; Ha, Chung-Eun (2015-01-01), Bhagavan, N. V.; Ha, Chung-Eun (eds.), "Chapter 15 - Protein and Amino Acid Metabolism", Essentials of Medical Biochemistry (Second Edition), San Diego: Academic Press, pp. 227–268, doi:10.1016/b978-0-12-416687-5.00015-4, ISBN 978-0-12-416687-5, retrieved 2020-12-17