Query Refinements Help

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.


The "drill-down" charts and links aim to give an insight of the main characteristics of the PDB entries in the query results and enable to easily focus on the subset of interest.

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. (see image)

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.


Drill-down Categories


Refine Query

This link will present the advanced search interface, which will list all the search criteria of the current query.

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


Remove Similar

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.



Drill-down chart examples

Mouse over the chart icons and drill-down links to reveal more detailed chart images



Click on the drill-down links to restrict the query results



Drilling down on a group may reveal more granular options