"We were able to engineer cells in a manner that allows us to control which cells they interact with, and also to control the nature of that interaction," said senior author Wendell Lim, PhD, director of UCSF's Cell Design Institute. "This opens the door to building novel structures like tissues and organs." Adhesive molecules can be found all throughout the human body creating communicative-bonds and immune pathways between tens of trillions of cells, but m