Erg1, Kcnq2, and Kcnq3 mRNA expression was often overlapping in the rat midbrain and hindbrain.3, Oculomotor nucleus; 7, facial nucleus;12, hypoglossal nucleus; Cu, cuneate nucleus; DC, dorsal cochlear nucleus; IC, inferior colliculus; IO, inferior olive;LDT, laterodorsal tegmental nucleus; LRt, lateral reticular nucleus; MG, medial geniculate nucleus; MVe, medial vestibular nucleus;Pn, pontine nucleus; RdN, red nucleus;SN, substantia nigra; Sp5, spinal trigeminal nucleus; VLL, ventral nucleus lateral lemniscus; VTg, ventral tegmental nucleus.