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: 6RFB
Crystal structure of the potassium-pumping S254A mutant of the light-driven sodium pump KR2 in the monomeric form, pH 4.3
Chain
A
Thermolysin - Bacillus thermoproteolyticus