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Changes in day sleep and numbers of PDF release sites after social exposure. The difference in average day sleep under socially enriched and isolated conditions is plotted for (a) DGRP_373, (c) SIP_L1_1, and (e) SIP_S2_7. Differences in PDF release sites under isolation and social enrichment for (b) DGRP_373, (d) SIP_L1_1, and (f) SIP_S2_7. * 0.01 ≤ p < 0.05; ** 0.001 ≤ p < 0.01; *** 0.0001 ≤ p < 0.001; **** p < 0.0001.
