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TEM images of buck sperm cells following in vitro exposure to 5 ppm of lead acetate for 15 min and 3 h. Irregular plasma membrane of sperm head (B), damaged plasma membrane (C) and loss of acrosome content (D and E) and swollen mitochondria and collapsed cristae in middle piece (F). No significant lesions or alterations in tail of the sperms at 15 min time point (A and G)
