Changes

'''Methionine is a neutral amino acid''', while '''cysteine is basic'''; both methionine and cysteine are '''gluconeogenic'''. Cysteine readily reacts with itself and other thiols (i.e. sulphur containing compounds) and cystine is formed from a disulphide bond between two cysteine molecules. Most of the plasma cysteine is actually found as cystine.

'''Methionine is a neutral amino acid''', while '''cysteine is basic'''; both methionine and cysteine are '''gluconeogenic'''. Cysteine readily reacts with itself and other thiols (i.e. sulphur containing compounds) and cystine is formed from a disulphide bond between two cysteine molecules. Most of the plasma cysteine is actually found as cystine.

Dietary methionine 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 methionine is actively reabsorbed in the [[Nephron Microscopic Anatomy#Proximal Tubule|proximal tubule]] of the [[Renal Anatomy - Anatomy & Physiology|kidney]]; dietary cysteine and cystine are absorbed in the small intestine and actively reabsorbed in the proximal tubule of the kidney via a dibasic amino acid transporter.

Dietary methionine 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 methionine is actively reabsorbed in the [[Nephron Microscopic Anatomy#Proximal Tubule|proximal tubule]] of the [[Renal Anatomy - Anatomy & Physiology|kidney]]; dietary cysteine and cystine are absorbed in the small intestine and actively reabsorbed in the proximal tubule of the kidney via a [[Nutrition Glossary#Dibasic Amino Acids|dibasic amino acid]] transporter.

==Why are they Important?==

==Why are they Important?==