Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Examples of main motifs of three and four nodes. We show the most frequent motifs in the network, in each case a particular example is shown. Positive interactions are represented by arrows with triangle end, negative interactions are drawn with bar end and unknown interactions are presented in dotted lines.
