Formation of Human Colonic Crypt Array by Application of Chemical Gradients Across a Shaped Epithelial Monolayer oleh Yuli Wang, Raehyun Kim, Dulan B. Gunasekara, Mark I. Reed, Matthew DiSalvo, Daniel L. Nguyen, Scott J. Bultman, Christopher E. Sims, Scott T. Magness, Nancy L. Allbritton