Once you are viewing a record of interest in the NCBI BioSystems Database, simply follow the link for "Other Links: Structures"

• The 3D protein structures associated with a biosystem are identified using the method described in the help document.



• Those 3D structures are accessible by selecting the Other links: Structures option that appears on search results pages and also in the upper left corner of an individual biosystem record.



• The 3D protein structures can then be viewed with Cn3D, a free helper application available for Windows, Macintosh, and Unix platforms. Cn3D installation takes only a couple of minutes and a tutorial describes the program's features and functions.