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AMINO ACIDS NEUTRAL – COO– OOC +NH3 +NH3 Glycine (Gly, G) COO– COO– +NH3 +NH3 (S)-(+)-Alanine (Ala, A) (S)-(+)-Valine (Val, V) (2S,3S)-(+)-Isoleucine (Ile, I) COO– COO– COO N+ (S)-(–)-Phenylalanine (Phe, F) (S)-(–)-Leucine (Leu, L) H H +NH3 +NH3 +NH3 (S)-(–)-Proline (Pro, P) (S)-(–)-Methionine (Met, M) COO– OH – COO COO– COO– HO +NH3 (2S,3R)-(–)-Threonine (Thr, T) HS +NH3 HO +NH3 (S)-(–)-Serine (Ser, S) COO– S – +NH3 (S)-(–)-Tyrosine (Tyr, Y) (R)-(–)-Cysteine (Cys, C) COO– O COO– H2N COO– +NH3 H2N O +NH3 N H +NH3 (S)-(–)-Asparagine (Asn, N) (S)-(+)-Glutamine (Gln, Q) (S)-(–)-Tryptophan (Trp, W) ACIDIC O - – O COO COO– - O O +NH3 +NH3 (S)-(+)-Aspartic Acid (Asp, D) (S)-(+)-Glutamic Acid (Glu, E) BASIC N H COO– +NH3 + N +NH3 HN H +NH3 N+ NH2 +NH3 H H (S)-(–)-Histidine (His, H) (S)-(+)-Lysine (Lys, K) COO– COO– (S)-(+)-Arginine (Arg, R) OTHER HO +NH3 COO– +NH3 - OOC COO– S S +NH3 (2R,7R)-(–)-Cystine (CyS–SCy) OH COO– N+ H H 3-Hydroxyproline +NH3 S-Ornithine COO– +NH3 +NH3 (S,S)-5-HydroxyLysine