Immunogen sequence: MSELEQLRQE AEQLRNQIRD ARKACGDSTL TQITAGLDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNKV. Heterotrimeric guanine nucleotide-binding proteins (G proteins), which integrate signals between receptors and effector proteins, are