Figure 5K. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2007.01.035] Dev Biol 305: 52-62, Pachikara A; Dolson DK; Martinu L; Riccomagno MM; Jeong Y; Epstein DJ, "Activation of Class I transcription factors by low level Sonic hedgehog signaling is mediated by Gli2-dependent and independent mechanisms." Copyright 2007 [PMID:17321515]