CD4 and Alzheimer disease: In AD patients, circulating CD4+ T cells express higher levels of TSLPR compared to healthy individuals, and the levels of circulating TSLPR+ CD4+ T cells correlate with serum Thymus and activation-regulated chemokine/chemokine ligand 17 (TARC/CCL17) and IgE levels, as well as eosinophil counts (42).