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Testicular capsule of the duck. Smooth muscle cells, predominant over collagen in the capsule, contain abundant microfilaments (F), cytoplasmic densities (arrow) and mitochondria (M) in the organelle space of the cell. Inset: arrowheads, pinocytic vesicles; M, mitochondria and R, rough endoplasmic reticulum in the organelle space; F, microfilaments; N, nucleus of the smooth muscle cell.
