title: Phylogenetic differences in the position of large and small cells of the formatio reticularis.
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D007798:Lampreys / Q000033:anatomy & histology*; D011893:Rana esculenta / Q000033:anatomy & histology*; D051381:Rats / Q000033:anatomy & histology*; D012154:Reticular Formation / Q000166:cytology*