How many drug targets are there?

@article{Overington2006HowMD,
  title={How many drug targets are there?},
  author={John P. Overington and Bissan Al-Lazikani and Andrew L. Hopkins},
  journal={Nature Reviews Drug Discovery},
  year={2006},
  volume={5},
  pages={993-996},
  url={https://api.semanticscholar.org/CorpusID:11979420}
}
A consensus number of current drug targets for all classes of approved therapeutic drugs is proposed, and an emerging realization of the importance of polypharmacology and also the power of a gene-family-led approach in generating novel and important therapies is highlighted.
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