Alignment of the deduced amino acid sequences of GlyR (KJ476181), GluCl (AHE41097) and GABA (AHE41094) receptors from R. microplus. The cysteines forming the Cys-loop are highlighted by red shading; the putative transmembrane domains (TM1–TM4) are shaded in gray. The PAR residues are highlighted in yellow. The glycine residue marked in turquoise likely confers upon the receptors sensitivity to ivermectin.