Fig. 5

Interlayer degree correlations. The Upper (lower) two figures illustrate the relations between the number of drug pipelines and the number of supplier–customer (ownership) links. The left (right) vertical axis corresponds to the number of self-loops (in-degree) at the drug pipeline layer’s launched state. Since the upper limits at approximately 100 for the out-degree in the ownership layer because of the data collection threshold, we do not compute the Pearson correlation coefficients of them