Note that the communication network has self-links since it is possible for a user to write messages on his/her own shoutbox.
This behavior concerns however only 28% of the users, and the self-links represent only 4% of the total number of links.
For instance, networks can (1) have different types of nodes and/or links; (2) contain nodes and links with a variety of properties associated with them (e.g., weights); (3) have links that can be directed; (4) contain multi-links, self-links, and hyperlinks; and (5) contain nodes of two distinct types, with links running only between unlike types (called bipartite).
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The weak intermolecular forces in recognition system direct the molecules toward self-linking in supramolecular engineering in the chemistry of life and material science.
The combination of the multitopic contact sites of hydrogen bonds coupled with two bulky aromatic cores promoted the molecule to self-link into a solid-state supramolecular architecture, which was almost insoluble in water and common organic solvents.
A slightly higher number of self-links in the yeast coAP/MS dataset compared to the combined yeast Y2H dataset argues for the former explanation.
The number of self-links, i.e. functional links on the diagonal of the matrix, can be assumed to give an indication of the functional organization in a dataset or a species.
We noticed that the number of self-links is larger in eukaryotes than in prokaryotes: T. pallidum (4 links, 1,039 genes), C. jejuni (6 links, 1,654 genes), E. coli (7 links [the average between [5] and [19]], 4,289 genes), yeast (16 links [Y2H], 20 links [Gavin], 6,200 genes).
As shown in Figure 6, the network contains 9 inter-gene regulatory pathways, apart from the self-links that are dominated by the respective self-decay rates.
The self-link for each gene is also considered but it is not counted toward the number of incoming links.
