Brill-Weil et al. show that axonal GABAA receptors regulate excitatory nicotinic input onto the axons of dopaminergic neurons. This regulation alters integration of the subthreshold nicotinic input to...

GPCR-based fluorescent sensors are widely used to correlate neuromodulatory signaling with brain function. While experiments in transfected cells often reveal selectivity for individual neurotransmitt...