In Foldit, a "ligand" is an atom or small molecule which is not part of the protein, but it expected to i
Ligand segment

In Puzzle 1315, the ligand at segment 129 represented a copper atom. View options "X-ray tunnel for ligand" and "Line+H" selected.

nteract with the protein.

A ligand has a segment number, although it's not technically a "residue".

The view option "X-ray tunnel for ligand" lets the user see through the protein to the ligand. This view option requires the "Show advanced GUI" option under "General Options".

Ligands and Foldit functionsEdit

Since a ligand has a segment number, many Foldit Lua functions can work with a ligand, but the results may not be as expected in all cases.

The function structure.GetSecondaryStructure normally returns "H" for helix, "E" for sheet, or "L" for loop, but returns "M" for molecule for a segment number that represents a ligand.

The function structure.GetAminoAcid normally returns a single-character amino acid code, but it may return "unk" or some other value for a segment number that represents a ligand.

The function structure.GetAtomCount returns an atom count.

The function band.AddBetweenSegments can band to or from a ligand segment.

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