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Glycine (abbreviated as Gly or G) is the smallest of the 20 amino acids commonly found in proteins, and indeed is the smallest possible (having a hydrogen substituent as its side-chain).
G 1397 (OTTO) Glycine, GR 99%+ Cas 56-40-6 - used to remove protein-labelling antibodies from Western Blot membranes to enable the probing of numerous proteins of interest from SDS-PAGE gel.