Fig. 4
The mean number of enteroendocrine cells (per 100,000 μm2) immunoreactive to the specified antisera within the uninfected intestines of Squalius cephalus (grey columns) and in counterparts infected with the acanthocephalan Pomphorhynchus laevis (black columns). Bars represent the mean standard error while the asterisk indicates a significant difference between groups (p < 0.01)