Activation of GPCRs which activate Gustducin which activates PDE which breaks down cGMP

Either H+ entry into the cell or blocking of K+ exit from the cell

Activation of GPCRs which activate Gustducin and then actions via the PLC-beta signalling pathway

Activation of GPCRs which activate Gustducin which breaks down cGMP

Activation of GPCRs which activate Gustducin which open ion channels for K+