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. 2005 Jan 19;22(4):1024–1031. doi: 10.1093/molbev/msi089

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Molecular Biology and Evolution vol. 22 no. 4 © Society for Molecular Biology and Evolution 2005; all rights reserved.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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FIG. 5.— — Distribution of the value of (1 − P) in ORFs 3, 4, 5, and 6 of PRRSV-A. The genes (ORFs 3, 4, 5, and 6) encode the envelope proteins (ORFs 3, 4, and 5) and the membrane protein (ORF6) of PRRSV-A. The figure indicates the distribution of the value (1 − P) for natural selection. When dn is larger than ds, the value is indicated above the abscissa, whereas in the opposite situation, below the abscissa. Light blue bars indicate positively selected sites (P < 0.05). The abscissa indicates the amino acid positions. The black rectangles indicate the experimentally recognized B-cell epitopes. The green rectangles indicate transmembrane regions.