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Fig. 6. Cyclic AMP synthesis in glycerol-treated and intact sperm. Sperm cAMP levels were measured 15 s after suspending intact and glycerol-treated sperm into various solutions. Glycerol-treated sperm were diluted in 100 mmol l–1 KCl, 100 mmol l–1 NaCl and 300 mmol l–1 KCl solutions. Intact sperm were diluted in 100 mmol l–1 NaCl and KCl solutions. Gray bars, percentage motility of intact sperm; black bars, glycerol-treated sperm. Values are means ± S.D. (N=3).