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<p>Conversely, a <b>radical replacement</b>, or <b>radical substitution</b>, is an amino acid replacement that exchanges an initial amino acid by a final amino acid with different physicochemical properties.</p>

<p><big> Description </big></p>
<p>There are 20 naturally occurring amino acids, however some of these share similar characteristics. For example, <a href="page.php?w=leucine">leucine</a> and <a href="page.php?w=isoleucine">isoleucine</a> are both <a href="page.php?w=aliphatic">aliphatic</a>, branched <a href="page.php?w=hydrophobe">hydrophobe</a>s.</p><p>
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