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TEM micrograph of sections of sperm with altered nuclei (N) and acrosomes (a). The chromatin appears uncondensed (uCh) and marginated, vacuoles (V) are present. Cytoplasmic residue (CR) is evident. All these alterations are characteristic of sperm pathologies such as immaturity and apoptosis. Axoneme (Ax). Bar 1 μm
