... by Company of Biologists 1997 Xenopus mesoderm Brachyury steroid receptor competence target gene FGF Analysis of gene function in Xenopus laevis is frequently carried out by means of over-expression experiments, in which RNA encoding the protein of interest is injected...

...Susanne Kramer; Steven R. West; Yasushi Hiromi ABSTRACT Drosophila seven-up is an orphan receptor of the steroid receptor family that is required to specify photoreceptor neuron subtypes in the developing compound eye. Expression of seven-up is confined to four of the eight photoreceptor precursors...

... by preventing four other photoreceptor precursors, R3/R4/R1/R6, from adopting the R7 cell fate. The seven-up gene encodes a steroid receptor-like molecule that is expressed only in those four cells that require seven-up function in the developing Drosophila ommatidium. We have examined the functional...