VDR and Hyperglycemia: Glycosylation is not apparently a feature of posttranslational modification of VDR, though slightly higher molecular weight bands have been reported in some tissues,(94) which could be a result of posttranslational modification.(95) These authors reported hyperglycemia‐induced enzyme mediated glycosylation (O‐linked‐N‐acetylglucosaminylation, or OGlcNAcylation) of VDR.(95) Tunicamycin competes with N‐acetylglucosamine phosphotransferase to inhibit N‐glycosylation(77) and would not be expected to inhibit OGlcNAcylation.