You may understand and further refine your query results by using the "drill-downs" by category, the "Refine Query" form or
"Remove Similar" drop down menu.
Clicking on the small summary charts which are available for some of the most important characteristics of PDB entries, will reveal more detailed
summary information and links that can be used to refine results with a single mouse click. (see image)
Moving the mouse cursor over the drill down links and the small chart icon, will pop-up more detailed charts, while
by clicking again on the chart icons, will focus in a large chart image of the data distribution for this category.
The "drill-downs" aim to be simple rather than complete and provide a small number of drill-down options.
Drill-down groups of small size, are not even displayed in the charts.
Drilling down by clicking on a link will either present more granular drill-down options, or a "inactive" label that indicates that further drill down
is not possible since all results belong in a single group. (see image)
Note: For categories of numbers or dates like resolution or release date, the drill down links include the lower bound value but do not
include the upper bound value. So for example the drill-down of 1.5-2.0 Armstrong, will include the entries with exactly 1.5 resolution
but not the ones with exactly 2.0 resolution (these will be included in the next 2.0-2.5 group)
If the available drill-down options are not satisfactory, clicking on the alternative "more choices ..." link will display the "Refine Query" form
for the corresponding category, where it is possible to refine the query more precisely.
Using this form you may change parameters of these criteria, remove any that you wish or add new criteria from the available "Query types".
For more information for Advanced Search look at the Advanced Search Overview
Filter search results based on sequence similarity and keep only "unique" structures.
Selecting a percent value from the pull down menu will filter the search results in such a way that multiple structures whose sequences have at least the specified level
of sequence identity will be represented by a single structure.
For further information on the methodology used for clustering and ranking sequence similar structures in the PDB, see Redundancy in the Protein Data Bank.
The RCSB PDB (citation) is managed by two members of the Research Collaboratory for Structural Bioinformatics:
RCSB PDB is a member of the
The RCSB PDB is funded by a grant from the
National Science Foundation, the
National Institutes of Health, and the
US Department of Energy.