Figure 1.

Examples of network motifs (a,c) and themes (b,d). (a,b) A transcriptional feed-forward motif that occurs repeatedly in the control of the cell cycle. (c,d) Two targets of transcription that are regulated by co-expression, protein-protein interaction or homology during periodic histone gene expression. Images reproduced from [1].

Weitzman Journal of Biology 2005 4:4   doi:10.1186/jbiol25
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