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Mean purine to pyrimidine ratios for each codon position of vaccinia virus Copenhagen major and minor ORFs. Positions marked with an asterisk (*) are statistically different.
| Purine/Pyrimidine (R/Y) ratio at each codon position | |||
| Position 1* | Position 2* | Position 3 | |
| Major ORFs | 1.77 | 0.99 | 0.93 |
| Minor ORFs | 1.21 | 0.75 | 0.96 |
