In addition, the general association between codon usage indices and composition constraint shows that mutational pressure plays an important role in determining codon usage variation of PRRSV, which is supported by the highly significant correlation between codon usage indices ( f ′ 1 ) and A 3 %, U 3 %, G 3 %, C 3 % ( Table 5 ).
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Analysis of synonymous codon usage in porcine reproductive and respiratory syndrome virus.
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