The Death Movement | Yosef Kaplan, Molecular Genetics Department, Weizmann Institute. Caspases, the executioners of programmed cell death, participate in the elimination of the cytoplasmic contents of the sperm cells during their maturation. This image demonstrates the 2 mm long developing sperm cells of the fruit fly Drosophila (nuclei in blue) and active caspases (in red). Caspase activation during this vital process is highly restricted in space and time by regulatory proteins (green).
Crepidula fornicata veliger larvae. Courtesy of Marine Biological Laboratory, Woods Hole, and Development