Neuroserpin expression in the first trimester of human brain development. A1–A5: neuroserpin is expressed in the upper cortical plate of the ventrolateral pallium in the 9th gw. B1–B5: neuroserpin is expressed in the upper cortical plate of the ventrolateral pallium in the 10th gw. B6–B7: the anterior thalamic neuroepithelium also contained neuroserpin‐ip cells with long processes. C1–C4: neuroserpin is expressed by a distinct neuronal population in the rhombencephalon in the 7th gw. No telencephalic expression was observed at this stage of development. MZ, marginal zone; CP, cortical plate; PSP, pre‐subplate; IZ, intermediate zone; SVZ, subventricular zone; VZ, ventricular zone. Scale bars: (A1) 1000 μm, (A2, B2) 200 μm, (A3–A5) B3–B6, (C3) 100 μm, (B1, C1) 2000 μm, (B7, C4) 50 μm, (C2) 500 μm.