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A chemical released in the bloodstream that sends signals to specific cells, causing them to change their behavior in specific ways.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
A chemical messenger that signals to specific cells to change their behavior in specific ways.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
2000</ref>
2000</ref>
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[[Category:Biology]]
[[Category:Molecular Biology]]