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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].



Berg, J. M., Tymoczko, J. L., & Stryer, L. (2002). Biochemistry (5th ed.). New York: W.H. Freeman.

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