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Amplification products of the VP7 gene. Lanes 1 and 2, first amplification products (1,062 bp); lanes 3 through 5, genotype G1 (749 bp); lanes 6 and 7, genotype G2 (652 bp); lanes 8 through 10, genotype G3 (347 bp); lanes 11 and 12, mixed infections with the G1G3 and G1G2 genotypes, respectively. φX174 digested with HaeIII (Roche Molecular Biochemicals) was used as the molecular size (M) standard.
