Glossary of "Plant Biology (1st ed.)" by Graham et al. (2003)
- Processes that occur during the cell cycle that allow the cycle to continue, unless defects are present, in which case the cell cycle stops.
Glossary of "The Cell (5th ed.)" by Alberts et al. (2008)
- Point in the eukaryotic cell-division cycle where progress through the cycle can be halted until conditions are suitable for the cell to proceed.
- Alberts, B., Johnson, A., Lewis, J. Raff, M., Roberts, K. & Walter P. 2008. Molecular Biology of the Cell, 5th ed. -xxxiii + 1268 pp. Garland Science, New York.
- Graham, L. E., Graham, J. M. & Wilcox, L. W. 2003. Plant Biology. -xxxv + 497 pp. Pearson Education, Inc., Upper Saddle River.