Chemo- and optogenetic activation of hypothalamic <em>Foxb1</em>-expressing neurons and their terminal endings in the rostral-dorsolateral PAG leads to tachypnea, bradycardia, and immobility

Foxb1 -expressing neurons occur in the dorsal premammillary nucleus (PMd) and further rostrally in the parvafox nucleus, a longitudinal cluster of neurons in the lateral hypothalamus of rodents. The descending projection of these Foxb1^(+) neurons end in the dorsolateral part of the periaqueductal gray (dlPAG). The functional role of the Foxb1^(+) neuronal subpopulation in the PMd and the parvafox nucleus remains elusive. In this study, the activity of the Foxb1^(+) neurons and of their …