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Boxplot of ω, dN, and dS (left to right) for autosomal and Z chromosome genes in B. mori / B. huttoni alignments. Median ω and median dN are significantly different between chromosome classes (P = 2.3 × 10−5 and P = 1.02 × 10−3, Wilcox-Mann-Whitney test), but dS is not (P = 0.1491).