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adding definition by Wells
'''Gene expression''' is the process by which a DNA sequence yields a functional product such as, for example, protein.<ref>{{cite book
|title=The Myth of Junk DNA
|author=Jonathan Wells
|publisher=Discovery Institute Press
|year=2011
|pages=90
|isbn=978-1-9365990-0-4
|url=http://books.google.com/books?id=Rc4ikgAACAAJ&dq=The+Myth+Of+junk+DNA&hl=en&sa=X&ei=cXYXUd_GAuTw4QSX_4GQAg&redir_esc=y
}}</ref>
If the DNA is correctly "read" and its recipe precisely followed, the "right" proteins will be produced in the cell and the gene will have been "expressed." If, however, the process is blocked, either through biological accident or through normal feedback mechanisms at higher levels, the gene is said to have been "repressed." [http://www.mygenes.co.nz/Ch1.pdf]
If the DNA is correctly "read" and its recipe precisely followed, the "right" proteins will be produced in the cell and the gene will have been "expressed." If, however, the process is blocked, either through biological accident or through normal feedback mechanisms at higher levels, the gene is said to have been "repressed." [http://www.mygenes.co.nz/Ch1.pdf]