Figure 1

Bottom-up construction of the gene expression network. The standard deviation ζ is given as a function of the connectivity q. The five curves correspond to the five model structures of eqs (5-9): dashed line: $m_{NC}^{pol}$; thick solid line: $m_{NN}^{exp}$; dashed-dotted line: $m_{NC}^{exp}$; dotted line: $m_{CN}^{exp}$; thin solid line: m _lin . (a) embryonic time series; (b) full time series.