CD69 and Alzheimer disease: The absolute numbers of CD4 + /CD69 + and CD4 + /γδT + cells showed a significant increase in the LowAhR and LowAhR + AD groups, whereas the LowAhR + AD + BJ group showed a significant decrease in the absolute number (CD4 + /CD69 + , p < 0.05 and CD4 + /γδT + , p < 0.001).