<p>A, Haemolytic activity of serum from different strains of mice. Mean ± SEM, N = 12 mice. B–D, complement gene expression in the liver (B), retina (C) and RPE/choroid (D) of different strains of 24-month old mice. Results are expressed as relative gene fold change of CCR2 KO or CCL2 KO mice against WT mice. Mean ± SEM, N = 6∼8, *, P<0.05 in comparison to WT mice, Dunnett's multiple comparison test.</p