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Recombination patterns, as determined using SNP genotyping, in progeny viruses isolated 2 and 4 days after coinoculation of SPF chickens with 104 PFU of each of CSW-1 and V1-99 ILTV. Each row corresponds to a virus isolate, with the CSW-1 SNPs indicated by gray boxes and the V1-99 SNPs by black boxes. Each distinct recombination pattern was given a unique genotype code (final column).
