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Use of PAA from metapleural glands of different worker size classes of A. cephalotes, showing the mean (+s.e.) proportion of infrabuccal pellets that did not germinate. Minim workers (HW = 0.6–0.8 mm) and minor workers (HW = 1.0–1.2 mm) more strongly inhibited germination of M. brunneum spores (black bars) than Escovopsis sp. (isolated from an A. cephalotes nest) (grey bars) relative to media (HW = 1.4–1.6 mm) and major workers (HW = 1.8–2.2 mm).
