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<p>the sensitivity of the gravitropic reaction.</p>

<p>Only some of the multiple phytochrome genes present in the plant genome participate in tropism regulation. </p>

<p><big> Biochemistry </big></p>
<p>Chemically, phytochrome consists of a <a href="page.php?w=chromophore">chromophore</a>, a single <a href="page.php?w=Bilin_%28biochemistry%29">bilin</a> molecule consisting of an open chain of four <a href="page.php?w=pyrrole">pyrrole</a> rings, covalently bonded to the <a href="page.php?w=protein">protein</a> moiety via highly conserved cysteine amino</p><p>
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