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Cysteine is a naturally occurring hydrophilic ("water loving") amino acid which has a sulfhydryl (SH) group and is found in most proteins. When it is exposed to air it
oxidizes to form cystine, which is two cysteine molecules joined
by a disulfide bond. One molecule of water (H2O) is the byproduct from the creation of each molecule
of cystine.
- Symbol: C or Cys
- Side chain type: hydrophilic
- Mass: 121.16
- Isoelectric point: 5.05
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