Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Cao, L, Qi, X and Han, T(2021). Co-immunoprecipitation of CCNK and DDB1 with 3xFLAG-CDK12 complex. Bio-protocol Preprint. bio-protocol.org/prep1122.
Lv, L., Chen, P., Cao, L., Li, Y., Zeng, Z., Cui, Y., Wu, Q., Li, J., Wang, J., Dong, M., Qi, X. and Han, T.(2020). Discovery of a molecular glue promoting CDK12-DDB1 interaction to trigger cyclin K degradation. eLIFE. DOI: 10.7554/eLife.59994