Reference Terms
from Wikipedia, the free encyclopedia


A hormone is a chemical messenger from one cell (or group of cells) to another.

All multicellular organisms produce hormones including plants.

The best-known animal (and human) hormones are those produced by endocrine glands of vertebrate animals, but hormones are produced by nearly every organ system and tissue type in a human or animal body.

Note:   The above text is excerpted from the Wikipedia article "Hormone", which has been released under the GNU Free Documentation License.
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