• Video 1 The series of contour plots of microtubule cross-sections (2.5 Å thick) observed from the plus end.
• Video 2 3D density map of GMPCPP microtubule with fitted atomic models of tubulins seen from the minus end of the microtubule.
• Video 3 Conformational change of β-tubulin in stereo seen from the plus end of the microtubule.