Fecal transplants are not likely to win as much attention as stem cell wonders or reprogrammed immunotherapy cells to fight leukemia, but for a patient with Crohn’s disease, the former might be just the right thing.  This piece discusses cell therapy as medicine’s third pillar (after small molecule drugs and biologics) and points out where it might be heading—e.g. engineered gut bacteria that can convert certain carbohydrates to a non digestible form as a strategy for treating obesity. MORE