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Fig. 5. Ultrastructural characteristics of MPII-containing cells (MPII-C). (A) Control worm intestine. Numerous mitochondria (m) are dispersed in the cytoplasm. ER and Golgi apparatus are poorly developed. nu, nucleolus. (B) MPII-C of the intestine from a chronically Cd-exposed worm, showing characteristic granules (g). mf, micro-filaments. (C) MPII-C from an acute Cd-exposed worm. Note the development of endoplasmic reticulum (ER) and Golgi apparatus (Go). Nucleolus (nu) shows intrication of fibrillar and granular material. En, enterocyte nucleus. (D) Proliferation of granular nucleolar material (asterisk) in MPII-C from a chronically Cd-exposed worm. Scale bar, 1 µm.





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