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Table 2 The similar pattern of codon usage in the target regions in both US and EU serotypes

From: Mapping codon usage of the translation initiation region in porcine reproductive and respiratory syndrome virus genome

ORFs The positions corresponding to similar codon usage pattern in the target region
ORF1a the 2nd to 4th, 6th to 8th, 10th, 11th, 14th, 15th, 17th, 20th to 24th, 26th, 29th to 36th, 39th, 44th, 45th, 48th
ORF2 the 3rd to 5th, 14th, 17th, 21st, 23rd, 24th, 28th, 31st, 34th, 36th, 37th, 41st, 44th, 46th, 49th, 50th
ORF3 the 2nd, 6th, 9th to 15th, 18th to 20th, 23rd to 26th, 28th to 31st, 33rd to 36th, 38th, 39th, 41st, 44th, 45th, 47th to 49th
ORF4 the 2nd to 10th, 12th, 13th, 15th to 18th, 20th, 22nd to 25th, 27th to 29th, 33rd, 34th, 36th, 37th, 39th, 40th, 43rd, 45th, 46th, 47th to 50th
ORF5 the 7th, 11th, 13th, 15th to 17th, 20th, 21st, 25th to 31st, 33rd, 37th, 39th, 41st, 50th
ORF6 the 11th, 17th, 18th, 20th, 23rd, 25th, 33rd, 38th, 41st, 43rd, 44th, 49th
ORF7 the 2nd, 5th, 6th, 8th, 9th, 15th, 18th, 21st to 23rd, 26th to 31st, 36th, 38th to 40th, 46th