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Arginine Histidine Arginine (Arg) (R) • Positively charged side chain Histidine (His) (H) • Positively charged side chain Amino Acids Lysine Amino Acids Aspartic Acid Lysine (Lys) (K) • Positively charged side chain Aspartic Acid (Asp) (D) • Negatively charged side chain Amino Acids Glutamic Acid Amino Acids Serine Glutamic Acid (Glu) (E) • Negatively charged side chain Serine (Ser) (S) • Polar, uncharged side chain Amino Acids Threonine Amino Acids Asparagine Threonine (Thr) (T) Asparagine (Asn) (N) • Polar, uncharged sidechain. • Polar, uncharged sidechain. Amino Acids Amino Acids Glutamine Cysteine Glutamine (Gln) (Q) • Polar, uncharged sidechain. Amino Acids Cysteine (Cys) (C) • Special Amino Acids H NH2 N H NH2 N HO HO N NH2 ⊕ NH2 O O NH2 NH2 O C HO HO NH2 O ⊕ O O NH2 NH2 HO OH HO O C O O O NH2 O NH2 O HO HO NH2 NH2 O O NH2 HO NH2 SH O HO NH2 O O Selenocysteine Arginine Glycine (Gly) (G) Selenocysteine (Sec) (U) • A-chiral • Special • Uncharged side chains Amino Acids Proline Amino Acids Alanine Proline (Pro) (P) • Uncharged side chains Alanine (Ala) (A) • Hydrophobic side chain. Amino Acids Isoleucine Amino Acids Leucine Isoleucine (Ile) (I) • Hydrophobic side chain. Leucine (Leu) (L) • Hydrophobic side chain. Amino Acids Methionine Amino Acids Phenylalanine Methionine (Met) (M) • Hydrophobic side chain. Phenylalanine (Phe) (F) • Hydrophobic side chain. Amino Acids Tryptophan Amino Acids Tyrosine Tryptophan (Trp) (W) • Hydrophobic side chain. Amino Acids Tyrosine (Tyr) (Y) • Hydrophobic side chain. Amino Acids NH2 NH2 HO HO SeH O O H NH2 N HO HO O O NH2 NH2 HO HO O O NH2 NH2 HO HO S O O H OH N NH2 HO NH2 HO O O Valine Valine (Gly) (G) • Hydrophobic side chain. Amino Acids NH2 HO O