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Number of attacks received by ORs and NRs from nonreproductive workers from colony parts 1 (
) and 2 (▪) (Wilcoxon matched-pair test; ***, P < 0.001; **, P < 0.01; n.s., not significant; observation time: colony A, 210 min; colony B, 230 min; colonies C and E, 420 min; colony D, 240 min).
