Use a protein database to model a structure. This menu can access both the main chain database [7] and side chain rotamers [13]. The data base files are loaded from the public area when used in the session. They go into the user's O database but are not written back when the database is saved because they have a status of R (readonly).
The main chain database consists of 32 protein structures that have been refined at high resolution. The side chain database consists of the rotamers that occur with a frequency >10% in the Ponder & Richards study [13].