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Comparison of the infection densities of the male-killing and non-male-killing spiroplasmas in 2-week-old adult D. hydei (hyd) and D. melanogaster (mel) insects. (A) Females. (B) Males. Sample sizes are given in parentheses. Different letters indicate statistically significant differences (generalized linear model; P < 0.05 after Bonferroni correction). The error bars represent standard deviations.
