Network properties - Network properties Metabolic and...

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Network properties Metabolic and signalling networks are complex: There are many nodes (proteins, particles, molecules) and many connections (interactions) . This is obvious from nearly any illustration of a network. And even if one can define sub-networks that can be meaningfully described in relative isolation (such as the citric acid cycle, or the ras p21 signalling network), there are always connections from it to other networks. The overall structure of a network can be described by several different parameters. For example, the average number of connections a node has in a network , or the probability that a node has a given number of connections . Theoretical work has shown that different models for how a network has been created will give different values for these parameters. One can also plot the relative frequency of each node as a function of the number of connections of the nodes. Both axes in the plot uses logarithmic scales. Using data
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