BMP1 and chronic kidney disease: Frequencies of BMP-1 IHC staining in tubules were not significantly different between CTRL and groups with CKD, NKB, or TXCI, respectively (CTRL vs. NKB, 87.5% vs. 94.7%, p = 1 and CTRL vs. TXCI, 87.5% vs. 97%, p = 0.348 for PXT, respectively, CTRL vs. NKB, 0% vs. 31.5%, p = 0.279 and CTRL vs. TXCI, 0% vs. 14.7%, p = 0.563; for DT, respectively).