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Gene haplotypes detected in soybean populations. (A) Rhg4 gene, with 27 segregating sites and 20 haplotypes detected. Haplotype 4 representing the SCN-resistant allele (Rhg4) and its closely related allele (haplotype 3) are shown in shadow. (B) Rhg4h gene, with 22 segregating sites and 18 haplotypes detected. Six non-synonymous substitution sites in the rhg4 gene and one in the rhg4h gene are labeled with asterisks.
