the trajectories taken by growing gabaergic fibers in the brainstem , mesencephalon and diencephalon at embryonic day 13 and at subsequent stages of development are coincident with regions of both monoaminergic and peptidergic differentiation and appear to correspond to recently reported patterns of benzodiazepine receptors which appear slightly later .
C0006121
brainstem
C0025462
mesencephalon