Sulfur-containing
amino acid. HS-CH
2-(Amino Acid Group). Most common residue involved in the formation of
disulfide bonds when oxidized (only occurs on the exterior of cells, as the cellular environment is a reducing one). Common in hair, structural
proteins and
secreted amino acids.
Formula: C
3H
7NO
2S
Molecular Weight: 121.16
Three-letter code: Cys
One-letter code: C