Yan, Nieng, Yanhui Xu, and Yigong Shi. (2006) 2006. “2:1 Stoichiometry of the CED-4-CED-9 Complex and the Tetrameric CED-4: Insights into the Regulation of CED-3 Activation”. Cell Cycle 5 (1): 31-4. doi:10.4161/cc.5.1.2263.

Qi, Shiqian, Yuxuan Pang, Qi Hu, Qun Liu, Hua Li, Yulian Zhou, Tianxi He, et al. (2010) 2010. “Crystal Structure of the Caenorhabditis Elegans Apoptosome Reveals an Octameric Assembly of CED-4”. Cell 141 (3): 446-57. doi:10.1016/j.cell.2010.03.017.

Yan, Nieng, Jijie Chai, Eui Seung Lee, Lichuan Gu, Qun Liu, Jiaqing He, Jia-Wei Wu, et al. (2005) 2005. “Structure of the CED-4-CED-9 Complex Provides Insights into Programmed Cell Death in Caenorhabditis Elegans”. Nature 437 (7060): 831-7. doi:10.1038/nature04002.

Yang, Chonglin, Nieng Yan, Jay Parish, Xiaochen Wang, Yigong Shi, and Ding Xue. (2006) 2006. “RNA Aptamers Targeting the Cell Death Inhibitor CED-9 Induce Cell Killing in Caenorhabditis Elegans”. J Biol Chem 281 (14): 9137-44. doi:10.1074/jbc.M511742200.