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The emergence of the endomesoderm in metazoan evolution was fundamental for the morphological diversification of animals. It promoted interactions between different tissues that led to novel structures and organs, such as the heart, bones, and kidneys. Drosophila and C. elegans are the most well studied models within the Ecdysozoa, the largest group of invertebrate animals, but show evolutionary d ...

"Genetic and mutant analyses in Drosophila and other standard model organisms have revealed hierarchical gene networks and identified some key regulatory genes acting in animal development. While surprising conservation exists on a broad scale between distant phyla, significant differences have also been detected. Systems biology approaches in the main model systems have now revealed more complex ...