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Fig. 3 | Frontiers in Zoology

Fig. 3

From: Feeding cessation alters host morphology and bacterial communities in the ascidian Pseudodistoma crucigaster

Fig. 3

Transmission electron micrographs of the branchial sac of active and resting zooids. a Stigmatal cells (sc) of an active phase, with cilia (c) in the lumen of the stigma. b Active phase, tangential section of distal part of stigmatal cells (sc); cilia (c) can be seen at both sides. c Resting form showing branchial sac filled with macrophages containing degenerating stigmatal cells (sc) with cilia (c) still recognizable, and apoptotic material (asterisks); (n): nucleus of a macrophage cell. d Resting phase, close-up of a macrophage with nucleus (n) and cytoplasm filled with big phagosomes, some with unrecognizable apoptotic material (asterisk), some with condensed stigmatal cells (sc) with their ciliary bundles (c). e Final resting phase in which cells with big vacuoles (some of them with cytoplasmic remains, asterisks) fill the thorax. f Beginning of the regeneration, new stigmatal cells (sc) are formed, and cilia (c) are visible in the newly formed lumen of the stigma. Scale bars for images represent 5 μm (A to F) and 15 μm (C)

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