The image shows a developing Drosophila spermatid immunostained for caspase activity (green). TRITC-phalloidin is used to label actin (red). Caspase is required in spermiogenesis for the elimination of unwanted organelles and cytoplasm via apoptosis.
See E. Arama et al. 2003 Caspase activity and a specific cytochrome C are required for sperm differentiation in Drosophila. Dev. Cell 4:687-697.
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