Sequence disparity in the N-terminus of Mas-related GPCRs in different species. (A) Snake diagram of secondary structure of MRGPRX2 with solid blue representing first 10 N-terminal amino acids. (B) Comparison of N-terminal sequence of human MRGPRX2 with the corresponding rhesus, cynomolgus (Cyno), minipig, pig, beagle, rat and mouse receptors.