Effects of MUN on the level of SLC2A1 and SLC2A3 protein expression in labyrinth zone from mid- and proximal-horn placentas. Representative immunoblots of SLC2A1 (A) and SLC2A3 (B) protein expression. Densitometric analysis of SLC2A1 (C) and SLC2A3 (D) protein expression. aindicates a significant difference between zone weights from MUN (black bars) vs. AdLib (open bars). bindicates a significant difference between proximal- and mid-horn placental positions.