Chaudhari SS, Noh MY, Moussian B, Specht CA, Kramer KJ, Beeman RW, Arakane Y, Muthukrishnan S. Knickkopf and retroactive proteins are required for formation of laminar serosal procuticle during embryonic development of Tribolium castaneum. Insect Biochem Mol Biol. 2015 May; 60:1-6.