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Comparison of the PRRSV recombinant strain 2072533 with one of its possible parental strains, the MLV vaccine strain. The red arrow points to the region of the genome where the recombination probably occurred. A full blue line indicates that both strains are identical in that given nucleotide position, and gray/white indicates that they differ at that position. The numbers on top of the blue bar indicate the nucleotide positions.
