ATP, Adcyap1, Fos, Gal, Gal transcripts, Gpr4, Gpr4 transcripts, Kcnk5, Kcnk5 or Gpr4 transcripts, Mouse, Neuromedin B, Neuromedin B mRNA, Nmb, Nmb mRNA, Nmb neurons, Nmb-high RTN neurons, Nmb-low RTN neurons, Nmb-low neurons, Penk, Penk and Gal transcripts, Phox2b, Phox2b-expressing, glutamatergic, non-catecholaminergic, noncholinergic neurons, RTN, RTN neurons, TASK-2, central respiratory chemoreceptors, chemoreceptors, hypercapnia, mice, nearby neurons, neurons, orexin, pre-pro-enkephalin, pre-pro-galanin, rats, serotonin, single, substance P