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Fig. 4. Transmission electron micrographs of principal secretory cells from the
salt gland of (A) FW-acclimated and (B) SW-acclimated C. porosus.
Transverse sections through a whole cell showing ultrastructural arrangement
of organelles typical of the principal secretory cells. Scale bars, 5 µm.
(C) Transmission electron micrographs of principal secretory cells from the
salt gland of a FW-acclimated C. porosus showing close apposition
between secretory cells and capillaries. Scale bar, 5 µm. (D)
High-resolution transverse section through the apical region of a principle
secretory cell showing junctional complex and short, irregularly shaped
microvilli protruding into the secretory tubule lumen. Scale bar, 1 µm. (E)
High-resolution transverse section though the lateral margins of two adjoining
cells demonstrating the interlocking arrangement of the long microvilli
(plici) of the basolateral membrane. Scale bar, 1 µm. l, secretory tubule
lumen; p, plicae; bm, basement membrane; n, nucleus; m, mitochondria; j,
junctional complex; mv, apical microvilli; v, small, clear, apical vesicles;
rbc, red blood cell; bm, basement membrane; cap, capillary; sc, secretory
cell.
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