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Individual cardiac progenitors emerge at defined positions within each segment in the trunk mesoderm. Their specification depends on segmental information from the pre-patterned ectoderm, which provides positional information to the underlying cardiac mesoderm via inductive signals. This pattern is further reinforced by repressive interactions between transcription factors that are expressed in neighboring...
The Drosophila heart is a highly ordered structure with only a limited number of cell types, which are arranged in a stereotyped metameric pattern. Ras signaling has previously been implicated in contributing to heart formation, but how positional information is integrated with this pathway to specify, distinguish and precisely position individual cardiac progenitors within the presumptive heart-forming...
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