Histidine (HIS or H) is a weakly hydrophilic amino acid. Histidine's pentagonal shape is unique in Foldit. In contrast, phenylalanine has a hexagonal shape, and is hydrophobic.
In the Foldit Lua interface, the functions structure.GetAminoAcid and structure.SetAminoAcid use lowercase "h" for histidine.
More information can be found at http://en.wikipedia.org/wiki/Histidine
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