LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Cysteine. Molecular model of the amino acid cysteine (C3.H7.N.O2.S). Structurally an alpha amino acid, cysteine is a non-essential amino acid. It can be synthesised by the body and so does not need to come from the diet. When used as a food additive, it has the E number E920. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and sulphur (yellow). Illustration.
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