Urinary parameters in β4GalT-I−/− mice. Increase of urinary albumin levels and hematuria with age in β4GalT-I−/− mice. A: Urinary albumin levels in β4GalT-I+/− (gray bars) and β4GalT-I−/− mice (black bars) at 10 to 14 (+/−, n = 19; −/−, n = 16) and 19 to 35 (+/−, n = 9; −/−, n = 9) weeks of age. The results are expressed as means ± SD. **P < 0.01, ***P < 0.001. B: Hematuria was tested using uropaper in β4GalT-I+/− and β4GalT-I−/− mice at each week of age.