TGFB1 and chronic kidney disease: Previous studies have demonstrated that total TGF-β1 (normalised to urinary creatinine) is also present in increased concentrations in the urine of cats with CKD (Arata et al, 2005, Habenicht et al, 2013), suggesting urinary TGF-β1 may be a useful biomarker of renal injury in feline CKD.