Fig. 3.

c-Fos expression is higher in the worker’s ACC. (A) Lever-press behavior of rats used in the c-Fos expression experiment (n = 7 groups). The duration of the stalemate phase varied between 3 and 8 d (4.86 ± 0.74; mean ± SEM). **P < 0.01, ***P < 0.001 (workers versus parasites, post hoc Sidak’s test following two-way repeated measures ANOVA). (B) Representative images of c-Fos immunoreactivity in coronal sections containing the ACC, PLC, and BLA. (Scale bar, Left, 400 μm; Right, 100 μm.) (C) Group data. **P < 0.01 (workers versus parasites, t test). Thin, soft-colored lines and scattered small circles/squares, individual animal data; large circles/squares and bar graphs, group means; and error bars, SEMs.