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Retention after tactile conditioning in bees of different behavioural groups (experiment 1). Percentage of bees showing the conditioned proboscis extension response (PER) at different time points after conditioning is presented. The only significant difference between groups is indicated: *P⩽0.05. The numbers of bees in each group are: nurse bees 6–13 days, 19; foragers 6–13 days, 22; nurse bees >15 days, 22; foragers >15 days, 14.
