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1. Normal sperm with a definite head by a marked hook and tail.
2. Amorphous-head.
3. More amorphous-head.
4. Sperm lacking hook.
5. Severely deformed s-shaped sperm.
6. Lacking head, banana-shaped sperm.
7. Coiled tail
Figure 5: Types of sperm-shape abnormalities found in normal and treated rats. (Magnification×1000).