Effect of IL17A Ab on the expression of S100 (A), HSP70 (B), and WASF3 (C) proteins by E. tenella schizonts. Light micrographs showing cecal wall sections taken 5 dpi from untreated chickens (A,B,C). Samples taken from IL17A Ab-treated chickens lacked of positivity for those three motility-related proteins as exemplified in D, where schizonts are devoid of positivity for S100 protein. Note the expression of those proteins versus the lack of positivity in IL17A Ab-treated chickens (D). Bars indicate: 200 μm in A, B and D; 100 μm in C.