F) Glucose uptake rates upon knockdown of Gnpnat1 or a G6pdx were measured in ES, Zscan4+ and 2-cell-like cells. Measurements were quantified relative to the glucose uptake rate of ESCs transfected with a negative control siRNA. Shown are the mean ± s.d. of the indicated number of independent cell cultures, performed across 2 or more independent biological replicates each. 