PROTEIN DATA BANK

Structure Atlas

4HHBExplore a protein

Deoxyhemoglobin

Loading experimental coordinates

Pick two atoms to measure distance

More experimental structures

Choose an example in the main view, or search the archive here.

Loading deposited coordinates

Advanced · scope and display

Deposited model Alternate location Show deposited waterColor Section depth

Section only hides geometry; coordinates and measurements remain original. B-factor uses the atom view; backbone guides use symbolic chain colors. B-factor is not confidence. Atom sphere size is illustrative, not van der Waals radius.

Inspect and measure

Atom

Pick two deposited atoms. The straight measurement segment is a coordinate separation, not a chemical bond.

Select two atoms for a distance in Å.

Source and coverage

RCSB source · Original mmCIF

Downloads reflect the current archive revision, not its state on an earlier date. For retained coordinate revisions and annual snapshots, use the wwPDB archive; revisions are not molecular motion.

Deposited asymmetric unit only. One explicit model and alternate selection. No biological assembly, chemical bonds, surfaces or missing-atom reconstruction. Backbone guide joins consecutive deposited CA/P markers only, with gap checks; it is not a ribbon or bond model. Limits: 20 MB file, 150,000 deposited atom records; oversized entries fail explicitly, never sampled.