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(a) A filament of Aiptasia diaphana containing packed cnidocysts. Bar, 100 µm. (b) Isolated cnidocysts. Bar, 25 µm. (c), A discharging cnidocyst. Following release of the folded 150-µm injector, only its smooth tip (50 µm long, submicron diameter) can penetrate the skin (see arrow). Bar, 25 µm.
