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Absolute folding energy per AA aligned position, window size = 31: (A) PCV1 ORF1; (B) PCV1 ORF2 (C) PCV2 ORF1; (D) PCV2 ORF2. Analyses of PCV1 were done based on coordinates of NCBI accession number AY18428758, analyses of PCV2 were done based on coordinates of NCBI accession number AY09461957.