Typical association network from the microbial community data. Round- (brown), square- (blue) and triangle- (green) shaped nodes are bacteria, eukaryotes and environmental factors, respectively. Solid (red) edges are positively associated, while dashed (blue) edges are negatively associated. Arrow indicates the time-delay direction.
Xia et al. BMC Systems Biology 2011 5(Suppl 2):S15 doi:10.1186/1752-0509-5-S2-S15