Plates were coated with growth factor-reduced Matrigel (BD Biosciences). NPC- and Olig2PC-Astro cell lines, both derived from human embryonic stem cells, were established and provided by Dr. Wenbin Deng (Sun Yat-sen University) 5 (link). NPC- and Olig2PC-Astros were cultured on separate plates in serum-free DMEM/F12 medium (Invitrogen) containing 1× N2 (Invitrogen), 1× B27 without retinoic acid (Invitrogen), 10 ng/ml BMP4 (Peprotech), and 20 ng/ml bFGF (Millipore). The medium was changed every 2 days until transplantation.
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