Biology Reference
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Fig. 7. The result of translating the network shown in Fig. 4 to a Petri net subject to rules shown on Fig. 6.
nuclei in the particular time frame. Such an analysis is contrasted with “the functional genomics point of
view” when regulations responsible for the all developmental processes are considered at the same time.
The most studied example of the developmental gene regulatory network that controls the specification
of endoderm and mesoderm in the sea urchin embryo is presented in [Davidson et al. , 2002].
The authors of [Mendoza and Alvarez-Buylla, 1998; Mendoza et al. , 1999] use the following classifi-
cation of the genes involved in the morphogenesis, with respect to times of their activity:
1. Genes active in the cells that are not part of the flower. During the morphogenesis they are active
only in the very early stage. The genes are EMF1 and TFL1 .
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