Glycine (GLY or G) is considered hydrophobic in Foldit. Glycine is unique in having no sidechain. The lack of a sidechain makes glycine the most flexible amino acid. Glycine is rarely found in a helix, as it tends to bend too freely and therefore it deforms the helix. It is commonly found in u-turns. In the Foldit Lua interface, the functions structure.GetAminoAcid and structure.SetAminoAcid use lowercase "g" for glycine.