>i</span>&#160;/ 
 <span style="font-size: 10.0pt; font-family: Symbol;">åå</span> <i>X</i><span 
	 style="font-size: 5.5pt; position: relative; top: 1.5pt;">I</span>&#160;/n</p>
<p>where <i>X</i><span style="font-size: 5.5pt; position: relative; top: 1.5pt;">i</span>&#160;is 
 the number of times the i<span style="font-size: 5.5pt; position: relative; 
								 top: -4.0pt;">th</span>&#160;codon has 
 been used for a given amino acid, and <i>n</i> is the number of synonymous 
 codons for that amino acid.