Relating to the movement of organisms or cells toward or away from chemical substances in their environment.
From chemotaxis (chemo- 'chemical' + -taxis from Greek taxis 'arrangement, order, movement'). The term developed in biology in the late 1800s to describe directed movement responses.
Sperm cells racing toward an egg aren't just swimming randomly—they follow a chemical trail like a bloodhound following a scent, guided by molecules the egg releases to attract them.
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