From www.youtube.com - January 26, 2012 4:04 PM

A computer animation demonstrates the flexible dynamics — the moving parts — of human IgG antibody. 3-D images of two individual antibody particles (gray) were generated using EM tomography with IPET. The demonstration shows how the same molecular chains (red, orange, and green noodle-like models) of antibody particle #1 can fit precisely into particle #2, which was found under the microscope in an entirely different pose.