Figure 4.
A schematic representation of how receptor promiscuity may lead to either the divergence of one signal transduction pathway into several downstream pathways or the convergence of signal transduction pathways into one pathway. (A) Rx, represents a single GPCR type that couples to two different G protein types G1 and G2, thereby diverging the signal into two independent signal transduction pathways. (B) R1 and R2 are two different GPCR types that both couple to a particular G protein type Gx, so that their signals converge into one signal transduction pathway