Figure 3

Patterns of microtubule orientation and concentration coincide with that of colloidal particles. The photographs are of the same self-organised preparation but taken using different optical set-ups. A) and B) show the pattern of microtubule orientation. A), is a photograph taken through crossed polars; B), through crossed polars and wavelength retardation plate. C), shows the pattern of microtubule concentration as observed by DAPI fluorescence (excitation 358 nm, emission 451 nm). D) shows the distribution of 1.0 μm diameter fluorescent polystyrene colloidal particles observed by way of their fluorescence (excitation 575 nm, emission 610 nm).