Figure 4B. Copyright: Reprinted with permission from Cell Press from [doi:10.1016/S0896-6273(00)80897-1] Neuron 25: 317-29, Lu QR; Yuk D; Alberta JA; Zhu Z; Pawlitzky I; Chan J; McMahon AP; Stiles CD; Rowitch DH, "Sonic hedgehog--regulated oligodendrocyte lineage genes encoding bHLH proteins in the mammalian central nervous system."Copyright 2000. [PMID:10719888]