  1 Motivation
  2 Results
  3 Introduction
  4 Methods
    4.1 Choosing a set of Databases
    4.2 Data extraction and visualisation
  5 Results
    5.1 Reuse within Databases
    5.2 Patterns of Reuse within databases
    5.3 Reuse between Databases
    5.4 Patterns between databases
  6 Discussion
    References
