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: 5IQR
Structure of RelA bound to the 70S ribosome
Chain
A [auth B]
Large ribosomal subunit protein uL2 - Escherichia coli K-12