Reference, please
Nociception, one of the physiological senses, is the term commonly used to refer to the perception of physiological pain. Pain in this context can be defined as a harmful stimulus which signals current (or impending) tissue damage. As a result and despite its unpleasantness, pain is nonetheless a critical component of the body's defence system...
...even plants can demonstrate the ability to retract from a noxious stimulus.
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