Col4a1 heterozygosity does not cause kidney defects. (A) Representative overview images of H&E- stained kidney sections from 6-mo-old mice. Scale bar = 1 mm. (B) Representative histological images showing the cortical (top panels), medullar (middle), and papillary (bottom) regions of the kidney. n = 7 for both groups. Scale bar = 100 μm.