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: 1AL1
CRYSTAL STRUCTURE OF ALPHA1: IMPLICATIONS FOR PROTEIN DESIGN
Chain
A
Aspartate aminotransferase - Escherichia coli