SOX9 and fetal growth restriction: Several genes selected for their functional role in SCs were dysregulated in response to UPI; at 5 dpp, Sox9 expression was decreased in IUGR rats compared to shams. Sox9 is a transcription factor of the SOX (SRY-related HMG box) family, which has a primary role in mammalian testis differentiation (Kanai et al. 2005).