Cryo-EM structure of the SARS-CoV-2 D614G,N501Y,E484K mutant spike protein ectodomain bound to human ACE2 ectodomain (focused refinement of RBD and ACE2)
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.