Cross section through a seminiferous tubule showing the developing sperm with their tails pointing into the lumen of the tubule. The nuclei are stained blue with DAPI and mitochondria red with mitotracker. Sperm have a large number of mitochondria to power their swim towards the egg. The image has been volume rendered using Imaris.
B0006849. Seminiferous tubule . Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/