Fig. 10

An immunohistochemical staining of anti-PCNA in the intestines of control and infected fish showing the significant difference in the number of mast cells within the epithelium (Ep) between the control and infected fish. (A and B) The intestine of control fish shows minimal immunoreactivity of PCNA (arrowheads). (C and D) The intestine of infected fish shows higher immunoreactivity of PCNA (arrowheads). The degranulation of mast cells is observed (double arrowheads)