Some structures are displayed as noodles (the “worm” representation). Why are they displayed improperly?
• The ribbon display preferences are incorrect • PDB entry lacks the secondary structure description • PDB entry is incomplete (e.g. Ca- only, or an ICM mini-xpdb object); therefore, the secondary structure cannot be assigned • Perform the following steps to fix your display preferences: Go to File.Preferences and click on the Ribbon tab. Then uncheck the Ribbon worm checkbox. Alternatively left-click on the ribbon icon in the Display dialog and select Ribbon . • If the above manipulations do not fix the problem, the problem could be attributed to the PDB entry’s lack of the secondary structure information. The secondary structure can be assigned with the Tools.Assign Helices and Strands menu. • It is possible that you are looking at an ICM mini-xpdb entry or a PDB entry with incomplete information about atom coordinates (could be a Calpha only entry). In this case the secondary structure could not be assigned.
