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: 4EU2
Crystal structure of 20s proteasome with novel inhibitor K-7174
Chain
A [auth W]
E3 ubiquitin-protein ligase NEDD4 - Homo sapiens