Expression of the neocortical marker, RORβ, in the entopallium and field L2 of adult chicken

► RORβ mRNA is a marker gene for layer IV of mammalian neocortex. ► RORβ mRNA is expressed in the entopallium and field L2 of adult chicken brains. ► The entopallium and field L2 are probably comparable to layer IV of mammalian neocortex.