Comparison of glycosidic torsions as present in the PDB. It becomes obvious that the residues involved in the linkage as well as the linkage position can influence the preferred conformation. The plots were generated with glyTorsion (see the legend to Fig. 2). Number of torsions per plot: (a) 247, (b) 454, (c) 1356, (d) 2755, (e) 162, (f) 211, (g) 76, (h) 362, (i) 162.