Fig. 1

Degree distribution. a, b Dual logarithmic coordinate diagrams of indegrees and outdegrees of LCC genes. c, d Histograms of indegrees and outdegrees of LCC genes. In each panel, the red and green line represent the average and median degree, respectively. In addition, the top 5% degrees are combined into the last column. e–l Histograms of indegrees and outdegrees of D\({\setminus }\)P, D\(\cap\)P, P\({\setminus }\)D and other genes, respectively. \({\setminus }\) and \(\cap\) are set operators. The dyadic operation between two sets A and B, say, resulting in the set A\({\setminus }\)B consisting of those elements that are in A but not in B. The dyadic operation between two sets A and B, say, resulting in the set A\(\cap\)B consisting of those elements that are in both A and B