Expression of MCT8 and OATP1C1 in human and macaque motor cortex astrocytes. Representative brightfield (A–E,I) photomicrographs of sections immunostained for MCT8 (A,C) and OATP1C1 (B,D,E,I) in cortical layer I (A–D) and subjacent white matter (E,I). Confocal microscope images of human (F–H) and macaque (J–O) sections double-labeled for OATP1C1 (green) and GFAP (red). Counterstaining with DAPI (blue) shows nuclei of all cells. Note that there is full colocalization of both markers. White and red arrowheads point to astrocytes. Blue arrowheads point to a blood vessel. GFAP: glial fibrillary acidic protein. Scale bar = 50 μm (A–D,J–L), 110 μm (E,I), 25 μm (F–H), and 78 μm (M–O).