EIF2AK2 and Schnyder corneal dystrophy: In the study by Carvalho-Filho et al. 27 PKR KO mice, regardless of being fed either a SCD or HFD, had fasting blood glucose concentrations of ∼3 mM (50–60 mg dl−1), compared with ∼8 mM (150 mg dl−1) for the WT mice.