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An electron micrograph of a section from the testis of a rat of group II showing the seminiferous tubules (ST) with a wavy, thickened basement membrane (arrow). The interstitial tissue contains eosinophil (ES) and congested capillaries (CAP). The leydig cells show irregular nuclei (N1-N2) and shrunken hyperchromatic one (N). Their cytoplasm show dilated smooth endoplasmic reticulum (S) and vacuoles (V) (TEM × 2000).
