Bar graphs showing concentrations of 24-hour urinary microalbumin (24 h mALB), transferrin (TRF), β2-microglobulin (β2-MG), and monocyte chemoattractant protein-1 (MCP-1) in each group of mice (A–D). Data are expressed as mean ± standard deviation (SD), n=6. * P<0.05; *** P<0.001; **** P<0.0001; ns, not significant.