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A family of developmental transcription factors; early Snail expression helps identify the ventral mesodermal domain of Drosophila melanogaster.

A ligand whose proteolytically activated form stimulates the Toll receptor in Drosophila melanogaster.

A receptor involved in embryonic patterning and immunity. In the early Drosophila melanogaster embryo, spatially restricted activation by Spätzle promotes nuclear Dorsal protein.

A beetle species used to study sequential insect segmentation and its relationship to the more simultaneous mode in Drosophila melanogaster.

A germ-plasm component in Drosophila melanogaster that participates in organising germline-associated molecular assemblies.

A developmental transcription factor; its early ventral expression in Drosophila melanogaster is useful for assaying presumptive mesodermal identity.