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Fig. 7. Transcription factor hierarchy in Drosophila MN specification. The factors activating Nkx6 and hb9 in ventrally and laterally projecting MNs are largely unknown. In ventrally and laterally projecting MNs, Nkx6 and hb9 act in parallel to activate the Lim-HD proteins Lim3 and Islet. Nkx6 and hb9 also repress the dorsally projecting MN determinant Eve. Since Eve also represses Lim3 and Islet, it is possible that eve repression is responsible for loss of Islet and Lim3 expression in Nkx6 hb9 double mutant embryos.





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