Formation of the embryonic organizer is restricted by the competitive influences of Fgf signaling and the SoxB1 transcription factors.
The organizer is one of the earliest structures to be established during vertebrate development and is crucial to subsequent patterning of the embryo.We have previously shown that the SoxB1 transcription factor, Sox3, plays a central role as a transcriptional repressor of zebrafish organizer gene expression.Recent data suggest that Fgf signaling ha