Fig. 4

Bar chart to show the distribution of ATC codes at three levels based on numbers of their highly related target proteins, structural features, and side effects. A Bar chart for ATC codes at the second level; B Bar chart for ATC codes at the third level; C Bar chart for ATC codes at the fourth level. The number above each bar represents the number of ATC codes having corresponding number of highly related entities. For example, 56 in (A) suggests that there are 56 ATC codes at the second level having 1–100 highly related target proteins