Transmission electron microscopy (TEM) of intestinal cells of Haemonchus contortus obtained from goats either (a) on control (polyphenol-free) diet, (b) fed tzalam fodder, (c) drenched with quebracho or (d) fed sainfoin fodder. The illustrations include nucleus (n), cytoplasm (ct), microvilli (mv), lumen (L), pseudocoele (ps) and the presence of vacuoles (v) and electrolucent areas (EA) indicated by arrows in Figure 3b.