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The molecular structures of the natural amino acids bearing a ionizable side-chain (Arg, Asp, Glu, His, and Lys) at different pHs: (A) Arg1, (B) Arg2, (C) Arg3, (D) Arg4, (E) Asp1, (F) Asp2, (G) Asp3, (H) Asp4, (I) Glu1, (J) Glu2, (K) Glu3, (L) Glu4, (M) His1, (N) His2, (O) His3, (P) His3, (Q) Lys1, (R) Lys2, (S) Lys3, and (T) Lys4.
