Essential Amino Acids ·Arginine(Arg) ·Tryptophan(Trp) ·Threonine(Thr) ·Methionine(Met) ·Lysine(Lys) 。Histidine(His) ·Valine (Val) ·Leucine(Leu) ·Phenylalanine(Phe)·Isoleucine(le) > Chapter 24 7Chapter 24 7 Essential Amino Acids • Arginine (Arg) • Threonine (Thr) • Lysine (Lys) • Valine (Val) • Phenylalanine (Phe) • Tryptophan (Trp) • Methionine (Met) • Histidine (His) • Leucine (Leu) • Isoleucine (Ile) =>