Fig. 6. Ultrastructure of filament epithelium viewed by transmission electron
microscopy (TEM) in normoxic control carp. (A) Pavement cell with cytoplasm
containing microvesicles with a dense core. (B) Mucous cell filled with
secretory granules. (C) Immature rodlet cell with developing rodlet granules.
GA, Golgi apparatus; M, mitochondrion; MG, mucous granule; MRC,
mitochondria-rich cell; PVC, pavement cell; RER, rough endoplasmic reticulum;
RG, rodlet granule. Scale bars, 2 µm.