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the middle part of the mammalian small intestine.
hormone produced by the pancreas, which catalyses the conversion of glycogen to glucose.
the main supporting cells of neurons in the peripheral nervous system (PNS).
an almost self-contained ecological unit.
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
parenchyma cells that are exposed to light and contain many chloroplasts. Chlorenchyma cells...