− | Histidine is an '''essential amino acid''' for dogs and cats. It is characterised as a gluconeogenic amino acid and contains a positively charged imidazole side chain. Dietary histidine is absorbed by a neutral amino acid transporter in the [[Small Intestine Overview - Anatomy & Physiology|small intestine]] (particularly the [[Jejunum - Anatomy & Physiology|jejunum]]) and plasma histidine is actively reabsorbed in the [[Nephron Microscopic Anatomy#Proximal Tubule|proximal tubule]] of the kidney. | + | Histidine is an [[Amino Acids Overview - Nutrition|'''essential amino acid''']] for dogs and cats. It is characterised as a gluconeogenic amino acid and contains a positively charged imidazole side chain. Dietary histidine is absorbed by a neutral amino acid transporter in the [[Small Intestine Overview - Anatomy & Physiology|small intestine]] (particularly the [[Jejunum - Anatomy & Physiology|jejunum]]) and plasma histidine is actively reabsorbed in the [[Nephron Microscopic Anatomy#Proximal Tubule|proximal tubule]] of the kidney. |