Within Canonical Analyses. All codons of the synonymous sequences of P. brachycephalum and Z. viviparus were plotted in a factorial map depicting the different counts for all combinations. The left polygon is comprising the codons with a G or C on the third position, the right polygon envelops those ending with A or T. Ellipses were computed from covariance estimates, characterizing the average canonical positions of the two sequence sets.
Windisch et al. BMC Genomics 2012 13:549 doi:10.1186/1471-2164-13-549