WebGL does not seem to be available.

This can be caused by an outdated browser, graphics card driver issue, or bad weather. Sometimes, just restarting the browser helps. Also, make sure hardware acceleration is enabled in your browser.

For a list of supported browsers, refer to http://caniuse.com/#feat=webgl.

Sequence Annotations in 3D: 7COU
Structure of cyanobacterial photosystem II in the dark S1 state
Chain
A
Photosystem II protein D1 - Thermostichus vulcanus