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As with blood, several types of human gut

PARIS — The human digestive tract, host to an ecosystem teaming with trillions of living bacteria, comes in three variations as distinct as blood groups, according to a study released Wednesday. These so-called “enterotypes” are found in populations worldwide and exist independent of race, country of origin, diet, age or…

Stem cells used to make pancreas, gut cells

Stem cells can be transformed into the pancreatic cells needed to treat diabetes and into complex layers of intestinal tissue, scientists demonstrated in two experiments reported on Sunday. In one, a team turned immature sperm cells into pancreatic tissue, while another team turned embryonic stem cells into complex layers of…