View source for Jukes-Cantor correction

==Example==
* Un-corrected distance:

<pre>
             *     *    *       *
Species A: ATGCT CGTAG CTGCT ACGTC
Species B: ATCCT CGAAG CAGCT ACGAC
</pre>

Count the changes (*) and divide by the length:

<pre>D(A,B) = 4/20</pre>

* Jukes-Cantor correction distance:

<pre>
             A     B
Species A: ----  0.20
Species B: 0.23  ----
</pre>

Apply the equation above to these data.