1. European Union, “Legislation for the protection of animals used for scientific purposes - Environment - European Commission,” can be found under http://ec.europa.eu/environment/chemicals/lab_animals/legislation_en.htm, n.d.
2. Public Law 106-545 106th Congress An Act, n.d.
3. Mechanistic studies of in vitro cytotoxicity of poly(amidoamine) dendrimers in mammalian cells
4. The Hill equation and the origin of quantitative pharmacology
5. O. US EPA, “Toxicology Testing in the 21st Century (Tox21),” can be found under https://www.epa.gov/chemical-research/toxicology-testing-21st-century-tox21, n.d.