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Goblet and secretory cells. Coloured transmission electron micrograph (TEM) of a section through a goblet cell (pink & blue) and secretory cells of the duodenum, part of the small intestine. The goblet cell secretes mucus which neutralises stomach acid. The mucigen granules (circular objects, at upper centre) combine with water to form the mucus. On either side of the goblet cell are the secretory cells whose secretions help in the digestive process. The microvilli (green hair- like structures,
Didinium attacking Paramecium | Didinium is a genus of unicellular ciliate protists with at least ten accepted species. All are free-living carnivores. Most are found in fresh and brackish water, but three marine species are known. Their diet consists largely of Paramecium, although they will also attack and consume other ciliates. Some species, such as D. gargantua, also feed on non-ciliate protists, including dinoflagellates, cryptomonads, and green algae.