Database Schema, designed by DBDesigner 4 (http://fabforce.net/dbdesigner4).
The small key symbol indicates the primary key for each table. Indices have
“index” in their names, listed after data fields in a table. (Top). Table
schema for SCOP, PSI-BLAST and PQS data tables. (Bottom). Table schema for PDB
data tables. Fields details, please see database
description.