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Light micrographs of Silver nitrate staining of rat kidney tissue. Control (a), AlCl3-treated group (b) and Fenugreek + AlCl3-treated group (c). (a) normal collagenous structures. (b) complete disappearance of Bowman's spaces (solid arrow), thinning in the tubules basement membrane which disappears sometimes (dotted arrow) and a fading of silver staining in the glomeruli. (c) normal aspect of collagenous structures. (×1000)