CX3CL1 and cyclic hematopoiesis: Urinary CX3CL1 levels were positively correlated with age in CN group (r = −0.430, p < 0.001) (Figures 3D, 4D), in the female CN subgroup (r = 0.523, p < 0.001) (Supplementary Figure S2D), and in the male CN subgroup (r = 0.464, p = 0.002) (Supplementary Figure S2D).