How is histidine the only amino acid whith a side chain that ionizes within a physiological pH? - Quora
![Side chain structure of the non-natural basic amino acids employed as... | Download Scientific Diagram Side chain structure of the non-natural basic amino acids employed as... | Download Scientific Diagram](https://www.researchgate.net/publication/247383878/figure/fig1/AS:369986741784577@1465223121254/Side-chain-structure-of-the-non-natural-basic-amino-acids-employed-as-substitutes-for-Arg.png)
Side chain structure of the non-natural basic amino acids employed as... | Download Scientific Diagram
![Figure 3 from Recognition of nucleic acid bases and base-pairs by hydrogen bonding to amino acid side-chains. | Semantic Scholar Figure 3 from Recognition of nucleic acid bases and base-pairs by hydrogen bonding to amino acid side-chains. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/a21f993ecccfdd6d02e400e776295e8d0f312b5e/7-Figure3-1.png)
Figure 3 from Recognition of nucleic acid bases and base-pairs by hydrogen bonding to amino acid side-chains. | Semantic Scholar
![amino acids grouped as hydrophobic, hydrophilic and amphipathic, and... | Download Scientific Diagram amino acids grouped as hydrophobic, hydrophilic and amphipathic, and... | Download Scientific Diagram](https://www.researchgate.net/publication/308675542/figure/fig2/AS:570301765619712@1512981944267/amino-acids-grouped-as-hydrophobic-hydrophilic-and-amphipathic-and-divided-into-groups.png)