Table 2 Codon usage differences between regions 1 and 2 and 49 MOCV-1 genes conserved in all poxviruses. The codon usage between regions 1 and 2 was first determined to be statistically equal and was then used to compare to the codon usage of 49 MOCV-1 genes that are conserved in all poxviruses. Student's t-test was used to compare codon usage with null hypothesis assuming codon usage was equal.

From: Host-derived pathogenicity islands in poxviruses