Asad Ahmad Attayek, P. J., Ahmad, A. A., Wang, Y. L., Williamson, I., Sims, C. E., Magness, S. T., & Allbritton, N. L. (2016). In vitro polarization of colonoids to create an intestinal stem cell compartment. PLoS One, 11(4). Ahmad, A. A., Wang, Y., Sims, C. E., Magness, S. T., & Allbritton, N. L. (2015). Optimizing Wnt-3a and R-spondin1 concentrations for stem cell renewal and differentiation in intestinal organoids using a gradient-forming microdevice. RSC ADVANCES, 5(91), 74881–74891. https://doi.org/10.1039/c5ra14923a