Comparison in the expression levels of genes coding for Kunitz-type trypsin inhibitor, hemoglobin, glycoprotein, trehalase, zinc metallopeptidase 13, ubiquitin-protein ligase, and sideroflexin 2 was performed between A. simplex (s.s.)larvae collected from different sites of infection and the control (Figure 1). Here, ART4 is linked to infection.