Fig. 1. Section cut through the medulla of an organism in the early stages of reformation of the axopodia. Situated around the nucleus (n) are twelve axonemes. These axonemes look normal with the exception that they are randomly orientated relative to each other. The arrows emphasize this by pointing along the plane of bilaterality induced in each axoneme by the overlap of the microtubules in each of the two interlocking coils (Tilney, 1968).