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

Bergstrom, K, Shan, X and Xia, L(2020). Composite agarose-polyacrylamide gel electrophoresis (Composite AgPAGE). Bio-protocol Preprint. bio-protocol.org/prep696.
Bergstrom, K., Shan, X., Casero, D., Batushansky, A., Lagishetty, V., Jacobs, J. P., Hoover, C., Kondo, Y., Shao, B., Gao, L., Zandberg, W., Noyovitz, B., McDaniel, J. M., Gibson, D. L., Pakpour, S., Kazemian, N., McGee, S., Houchen, C. W., Rao, C. V., Griffin, T. M., Sonnenburg, J. L., McEver, R. P., Braun, J. and Xia, L.(2020). Proximal colon–derived O-glycosylated mucus encapsulates and modulates the microbiota. Science 370(6515). DOI: 10.1126/science.aay7367