CCL22 and Alzheimer disease: In a more recent study of another population with AD, the same research group developed a new division that only partly overlapped with the previous results: in the newer division, cluster A comprised patients with higher levels of skin-homing C-C chemokines (CTACK/CCL27, TARC/CCL17, MDC/CCL22 and RANTES/CCL5) and IL-1R1; this “skin-homing chemokines/IL-1R1–dominant” cluster did not correspond to any cluster from the earlier division.