How does the zwitterionic form of an amino acid relate to the pI? When the pH is exactly at the pK a value, a buffer arises in which the deprotonated and protonated amino acids exist in ...

Histidine is an amino acid derived from proteinaceous dairy- and meat-based products. As one of 20 amino acids, it pays an important role in the body. This article examines histidine metabolism ...