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

Winslow, M, Sage, J and Yang, D(2020). In vitro 2d matrigel migration and protrusion assay. Bio-protocol Preprint. bio-protocol.org/prep485.
Yang, D., Qu, F., Cai, H., Chuang, C., Lim, J. S., Jahchan, N., Grüner, B. M., S Kuo, C., Kong, C., Oudin, M. J., Winslow, M. M. and Sage, J.(2019). Axon-like protrusions promote small cell lung cancer migration and metastasis. eLIFE. DOI: 10.7554/eLife.50616