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One conserved characteristic is a viral sensing mechanism that relies on a specialized enzyme known as a cyclase.

Instead, the "sperm-swim" switch they are targeting is a cellular signalling protein called soluble adenylyl cyclase or sAC.

For example, it can interact with transition metals such as those in the haem group of guanylyl cyclase enzymes, which produce cyclic GMP — a messenger molecule involved in many biological processes.

Manejwala, F., Kaji, E. & Schultz, R. M. Development of activatable adenylate cyclase in the preimplantation mouse embryo and a role for cyclic AMP in blastocoel formation.

Secretory cells elaborate their products in privacy; the heart contracts and relaxes; hormones are sent off to react silently with cell membranes, switching adenyl cyclase, prostaglandin, and other signals on and off; cells communicate with each other by simply touching; organelles send messages to other organelles; all this goes on continually, without ever a personal word from us.