Drives expression in a subset of pacemaker neurons.
Expression is within all LN neurons, a subset of the DN1 and DN3 neurons, and not at all in the DN2 neurons. Expression was not seen in the third instar larval Pdf negative s-LNv neuron. Fibres of the Pdf negative s-LNV neuron were observed to project towards the accessory medulla and arborize in its central area.