Fig 2. Alignment of the human A2b adenosine receptor and N-terminal part of AdoR amino acids sequences of other insects and Plutella xylostella.

Different color shows different homology levels. Black means 100% homology level, pink shows 75% homology level, blue stands for 50% homology level, and yellow marks 33% homology level. The PxAdoR and human adenosine receptors share the same key residues marked by red solid border and the mismatched key residues between PxAdoR and human adenosine receptors are marked by black solid border. “#” sign indicates the special residues of PxAdoR compared with human adenosine receptors.