TGFB1 and chronic kidney disease: However, there was no difference in the expression of the pro-fibrotic TGFβ between CKD and NL (0.75±0.2, 0.89±0.19, p = 0.26, respectively), nor was there a difference in the picrosirius stain for fibrosis (8.06±4.87 (CKD), 9.16±2.6 (NL), p = 0.51; S2 Fig).