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Codon usage in the ORF5 gene of Spanish sequences of porcine reproductive and respiratory syndrome strains (1991–1995 and 2000–2005)
AA: aminoacid; N: number of effective codons; RSCU: synonymous codon usage measure. In bold is shown the most frequent codon for each aminoacid. Boxes show the main changes between 1991–1995 and 2000–2005 sequences.
