The abbreviations used are: C, the catalytic unit of adenylate cyclase; N, the regulatory, GTP binding protein; Gpp(NH)p = guanyl-5'-yl imidodiphosphate.2 Bull sperm possesses both membrane-bound (70%) and cytosolic (30%) adenylate cyclase (13, and personal data).
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Stengel et al. (1982) studied this question.
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