January 2009
World Book Science Dataset;1/1/2009, p1
Reference Entry
Gallstone, a hard object that forms in the gall bladder, cystic duct, hepatic duct, or bile duct. Gallstones are irregular in shape, and are usually about the size of a pea or a marble, but may be much larger. They vary in color from yellow to red or black. Gallstones are composed of calcium, bilirubin (a pigment), bacteria, and crystallized cholesterol.


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