The self-ordered microtubule phase differs from non-ordered phase in terms of microtubule length distributions parameters and interface gaps. The length distribution in ordered (), and disordered phase (), at 36°C, and MTP concentration: 5 mg/ml A(a); 2.0 mg/ml B(a). Then at 26°C, and MTP concentration 5 mg/ml C(a). A typical examples of electron microscopy images of ordered and disordered microtubules phase, taken at stationary state of microtubule assembly, at 36°C, and MTP concentration: 5 mg/ml A(b); 2.0 mg/ml B(b). Then at 26°C, and MTP concentration 5 mg/ml (C(b). White dotted ellipse marks the fiber constituted by staggered microtubules. Figures A(c), and B(c) are details taken from Figures A(b) and Figure B(b) respectively; arrows indicate interface gap. White ellipse marks the fiber constituted by non-staggered microtubules. Bars are 0.5 μm.