Abstract
The structure of isolated paracrystals of tubulin, induced in unfertilized sea urchin eggs with vinblastine sulphate, has been studied in sectioned material. Three distinctive patterns have been found and all can be observed by the systematic reorientation of sections in a goniometer stage or by sectioning different, suitably orientated paracrystals. One pattern is made up of six-pointed stars: the other two consist of arrays of parallel lines; one with repeating rungs approximately perpendicular to the main axis; the other of linear arrays of interconnected beads. The principal dimensions of these patterns have been determined by diffraction methods.
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