BCL2 and Hyperglycemia: NAC administration added at the stage of developed hyperglycemia did not counteract an increase in Bax and Bcl-2 levels as well as the Bax/Bcl-2 ratio in the mitochondrial fraction of the parotid glands of rats, which resulted in considerably higher concentrations of Bax, Bcl-2, and the Bax/Bcl-2 ratio compared to the controls (↑31% p = 0.0052, ↑24% p = 0.0315, ↑48% p = 0.0310, respectively).