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Bacterial elemental sulfur vesicles of different thiotrophic symbiosis. A–C. Symbionts of the vestimentiferan Riftia pachyptila (A), of the giant ciliate Zoothamnium niveum (B), and the stilbonematin nematode Laxus oneistus (C), all fixed similar to S. contortum as described in Eichinger and colleagues (2011). Sv, sulfur vesicle.
