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The histological section of the ovary of a M. tengara during the early spawning phase (June) showing an apoptotic mature follicle (mf) bearing conspicuous pycnotic nuclei (white arrows) of the zona granulosa layer and intact theca layer (th) when the tissues are treated with ZnS nanoparticles at the concentration of 250 μg/L [Mallory's triple stain].
