TGFB1 and diabetes mellitus: The plasma creatinine levels were not significantly different between the diabetic and non-diabetic TGFβ1 TG mice at weeks 2 and 6 after STZ injection but significantly increased in the diabetic TGFβ1 TG mice compared to the non-diabetic TGFβ1 TG mice at week 9 after the induction of DM with STZ.