Telencephalic inhibitory interneurons, including cells from the olfactory bulb, cortex, hippocampus, and thalamus, formed a separate taxon, with the olfactory cells as a distinct subgroup. The thalamic inhibitory neurons expressed Meis2 and shared key transcription factors (e.g., Dlx1, Dlx2, Dlx5, Dlx6) with other cell types in this taxon, as well as with striatum MSNs, consistent with a common developmental origin in the ganglionic eminences.
