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: 1VGK
The crystal structure of class I Major histocompatibility complex, H-2Kd at 2.0 A resolution
Chain
A
H-2 class I histocompatibility antigen, K-D alpha chain - Mus musculus