Longitudinal microtubules in a chicken primary culture multinucleated myotube. In the left panel, microtubules are visualized in this laser confocal section with specific antibodies and compared to nuclei, stained with Dapi. In the right panel, the same cultured myotube is visualized with differential interference contrast optics, which shows the myofibrils and the nuclei (again compared with the Dapi stain). Note that there are no conspicuous microtubule-organizing centers, although it is possible to see an accumulation of microtubules around the nuclei.
