CCL18 and Alzheimer disease: Other cytokines and chemokines characteristic of AD pathology, such as pulmonary and activation-regulated chemokine (PARC/CCL18), eotaxin-3/CCL26, macrophage-derived chemokine (MDC/CCL22), cutaneous T-cell-attracting chemokine (CTACK/CCL27), and IL-13, were also among the 40 “Stepwise” proteins.