Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:
Liu, S and Guo, J(2020). Protein expression and purification. Bio-protocol Preprint. bio-protocol.org/prep498.
Liu, S., Chang, S., Han, B., Xu, L., Zhang, M., Zhao, C., Yang, W., Wang, F., Li, J., Delpire, E., Ye, S., Bai, X. and Guo, J.(2019). Cryo-EM structures of the human cation-chloride cotransporter KCC1. Science 366(6464). DOI: 10.1126/science.aay3129