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

Liu, X, Yang, C and Yeung, K(2021). In vitro immunoregulation of osteogenesis of MSCs. Bio-protocol Preprint. bio-protocol.org/prep1145.
Zhu, Y., Liang, H., Liu, X., Wu, J., Yang, C., Wong, T. M., Kwan, K. Y. H., Cheung, K. M. C., Wu, S. and Yeung, K. W. K.(2021). Regulation of macrophage polarization through surface topography design to facilitate implant-to-bone osteointegration . Science Advances 7(14). DOI: 10.1126/sciadv.abf6654