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Histological changes in positive control group (group B). B1: (positive control) oxalate crystals in cortical tubules near glomerulous (40 × 400). B2: Tubules mostly blocked with crystals with desquamated epithelia (40 × 400). B3: Wide urinary space of Bowman’s capsule (40 × 400). B4: Chronic pylonephritis with thyro-dizationor necrotic tissue (10 × 100).
