... the oral part of the apical neurogenic field. Sea urchin embryogenesis Spatial gene expression Transcriptional repression Neurogenic ectoderm Summary: The neurogenic ciliated band of the sea urchin embryo can be divided into four domains, whose boundaries are defined by a network...

... out of seven predicted enhancers direct restricted expression within ventral regions of the neurogenic ectoderm. Mutations in some of the shared motifs disrupt enhancer function, and evidence is presented that the Twist and Su(H) regulatory proteins are essential for the specification of the ventral...