Glossary of "Evolution of Plants (2nd ed.)" by Willis & McElwain (2014)
- The region on the surface of an enzyme that holds the substrate.
Glossary of "The Cell (5th ed.)" by Alberts et al. (2008)
- Region on the surface of one molecule (usually a protein or nucleic acid) that can interact with another molecule through noncovalent bonding.
- Alberts, B., Johnson, A., Lewis, J. Raff, M., Roberts, K. & Walter P. 2008. Molecular Biology of the Cell, 5th ed. -xxxiv + 1616 pp. Garland Science, New York.
- Willis, K. J. & McElwain, J. C. 2014. The Evolution of Plants, 2nd ed. -ix + 398 pp. Oxford University Press, Oxford.