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An electron micrograph of a section from the testis of a rat of group III showing basal lamina (BL) of seminiferous tubule (ST), a myoid cell (MY) as well as spermatogonic cells (SG). The interstitial cell of leydig (Ld) appears with euchromatic nucleus (N). The cytoplasm contains mitochondria (M), smooth endoplasmic reticulum (S) and lipid droplets (L) (TEM × 3000).
