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Fig. 3. Distribution of NKCC during the ontogeny of Dicentrarchus labrax.
of (A) Embryo; (B) 1-day-old prelarva; (C,C',D) 3-day-old prelarvae. (A)
Transverse section showing apical staining in the cells lining the digestive
tract (DT) and basolateral staining in the tegumentary ionocytes (TI). (B)
Transverse section of the developing branchial chamber, showing immunostained
chloride cells (CC) are already present on the opercular membrane (O) and the
branchial slits (BS). (C) Longitudinal and (C') transverse sections of
prelarvae with intense staining of the intestinal brush-border. Note the
immunopositive tegumentary ionocytes. (D) Transverse section showing weak
apical staining of the renal collecting ducts (CD) and apical staining of the
digestive tract. M, muscle; NC, notochord. Scale bars, 10 µm (A,C'),
20 µm (B,C,D).