Histologic characterization of cerebral organoids.
(A) Paraffin-embedded 4-week-old control cerebral organoid sectioned and stained with H&E. Scale bar, 250 μm. (B) Electron microscopy of 4-week-old control organoid shows columnar cells lining the ventricle-like structures, with cilia protruding into the ventricle space (arrows). Scale bars, 5 μm (left image); 1 μm (right image). (C) Representative immunofluorescence images of 4-week old control organoids stained for SOX2, a marker for neural progenitors (top panel) and SOX2/DAPI-merged staining (bottom panel). Scale bars, 500 μm. (D) Representative immunofluorescence images of 4-week old control organoids stained for GFAP, a marker for astrocytes (top panel) and GFAP/DAPI-merged staining (bottom panel). Scale bars, 500 μm.