About 25 receptors are reported to couple to the G12/13 G protein subtype (Riobo & Manning, 2005).Direct assay methods have not identified a receptor that only couples with G12. At least one receptor (5-HT4) only couples with G13, but most other receptors are reported to couple with both G12 and G13.
Nakahata, N
Riobo, NA, Manning, DR
Maruyama, Y, Nishida, M, Sugimoto, Y, Tanabe, S, Turner, JH, Kozasa, T, Wada, T, Nagao, T, Kurose, H
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