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Characteristics of open reading frames UL146, UL147, and UL147A.
| Open reading frame | Number of nucleotides | Number of amino acids | Maximum nucleotide variability | Maximum amino acid variability |
| UL146 | 342–375 | 114–125 | 58% | 61% |
| Intergenic region | 43–214 | ----- | ----- | ----- |
| UL147 | 471–477 | 157–159 | 13% | 15% |
| UL147A | 228 | 76 | 7% | 8% |
