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RP-HPLC of partitioned queen head extract. Workers in the bioassay were from a wild-type (not selectively bred) colony with a low QMP response. One-way ANOVA: F = 11.1, P < 0.0001, n = 10. In Figs. 1–5, treatments with the same letter are not significantly different (P < 0.05, by Tukey–Kramer test).
