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Transmission electron microscopy analysis of spermatozoa. a Normal control spermatozoon showing the annulus at the junction of the MP and the PP. b Annulus was not organized in caudal end of middle piece in spermatozoa in infertile patient diagnosed with asthenozoospermia. Note that fibrous sheath (FS) is relatively disorganized. M mitochondrial sheath. Bars: 0.25 μm
