Figure 3: Histochemiical analysis of anterior intestine of grass carp. A: Positive reaction of goblet cells to PAS (arrowhead). B: positive reaction of goblet cells to Alcian blue (arrowhead).C: the epithelium of anterior intestine of grass carp showing PAS- and Alcian blue- positive goblet cells (arrow). (Combined AB and PAS). D: the epithelium of anterior intestine of grass carp showing oval- shaped enteroendocrine cells (arrow). (Grimelius).