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Glycine is one of the 20 amino acids.  It's three letter code is Gly, and it's single letter code is G. It is the simplest amino acid, with a hydrogen atom as a side chain - this means glycine is the only amino acid which does not have a chiral carbon atom [1], so it does not form stereoisomers therefore will not have L or D configurations.

Glycine has a function outside of the cell. It plays a vital role in the central nervous system as is acts as a neurotransmitter in chemical synapses [2].

Glycine has two hydrogens attatched to the alpha carbon and is found in flexible areas of proteins due to its short side chain [3].



  1. Priv.-Doz. B. Kirste. (01-23-1998). Glycine. Available: Last accessed 23-11-2010.
  2. Molecular biology of the cell,4th edition, 2002, Bruce Alberts, Alexander Johnson , Julian Lewis, Martin Raff , Keith Roberts and Peter Walter. Page 764
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