Polycomb group proteins confer robustness to aposematic coloration in the milkweed bug, .

Aposematic coloration offers an opportunity to explore the molecular mechanisms underlying canalization. In this study, the role of epigenetic regulation underlying robustness was explored in the aposematic coloration of the milkweed bug, () and (), which encode components of the Polycomb repressive complex 1 (PRC1) and PRC2, respectively, and , which encodes a component of the PRC2.2 subcomplex, were knocked down in the fourth instar of .