a shift in the staining nature of these cells from acidic glycoprotein to neutral glycoprotein , acidic glycosaminoglycans in the opercular epidermis and acidic glycoprotein to neutral glycoprotein and then again to acidic glycoprotein + acidic glycosaminoglycans in the gill filament epithelium reflects a change in the physiological status of fish .
C0007634
cells
C0010851
filament