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digestive-system × 149human-biology × 44
food × 27
digestion × 27
physiology × 19
biochemistry × 15
nutrition × 12
zoology × 10
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proteins × 8
metabolism × 8
enzymes × 7
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bacteriology × 6
pathology × 6
gastroenterology × 6
human-anatomy × 5
cell-biology × 4
stomach × 4
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pharmacology × 3
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hematology × 3
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mammals × 3
