Since the asparagine's sidechain can form hydrogen bonds with the protein's backbone, asparagine is often found near the beginning and the end of helixes, and in turns near sheets. Its role can be thought of as "capping" the hydrogen bond interactions that would otherwise be satisfied by the polypeptide backbone. In the Foldit Lua interface, the functions structure.GetAminoAcid and structure.SetAminoAcid use lowercase "n" for asparagine. For more, see Asparagine on wikipedia.