Table 2. Number of annotations per class used in the training and test sets of U-Net.

		Normal tubules		Abnormal tubules
	Glomeruli	Proximal tubules	Distal tubules	Atrophic tubules	Tubulitis	Degenerated tubules	Arteries
Train	141	2,798	1,877	1,465	618	1,307	205
Test	35	700	469	266	155	327	51
Total	176	3,498	2,346	1,831	773	1,634	256