Fig. 1
From: The organelle of differentiation in embryos: the cell state splitter
“The GRN [Gene Regulatory Network] model illustrating the genomic control of 2D expression pattern formation in the sea urchin ectoderm. This model is a BioTapestry presentation of all interactions among regulatory genes governing ectoderm regulatory state diversification up to the onset of gastrulation. The circuits show that domain-specific repressors are commonly used to define the boundaries along both embryonic axes.” From [2] with blanket permission for use “in a review article” per http://www.pnas.org.uml.idm.oclc.org/site/aboutpnas/rightperm.xhtml