Glomerulus in the kidney of a golden retriever

In this renal corpuscle you can see both the vascular and the urinary poles. Some of the capillaries in the glomerulus contain red blood cells. Notice the difference is staining between the proximal convoluted tubules and the distal convoluted tubule which contains the macula densa (the string of blue nuclei). Original mag. 100x. H&E Kidney Cortex Urinary System Dog