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Host-symbiont stress response to lack-of-sulfide in the giant ciliate mutualism

Fig 4

Symbiont response to sulfide starvation applying SEM.

Microzooid from colony freshly collected from the environment (A), and several colonies after 48 h in oxic seawater (B-G); (B) overview of colony covered in part with mucus; (C-G) microzooids with symbionts fully covering the host, and with gradually less and less symbiont coverage; arrows point to very long rods most likely not symbionts.

Fig 4