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| y-linked genetic diseases | | Genetic diseases that are linked to mutant alleles on the ... |
| yang deficiency | | In the Yin-Yang system of philosophy and medicine, a lack ... |
| yawning | | An involuntary deep inhalation with the mouth open, often accompanied ... |
| yaws | | A systemic non-venereal infection of the tropics caused by Treponema ... |
| yellow fever | | An acute infectious disease primarily of the tropics, caused by ... |
| yellow fever virus | | The type species of the flavivirus genus. Principal vector transmission ... |
| yin deficiency | | In the Yin-Yang system of philosophy and medicine, an insufficiency ... |
| yin-yang | | In Chinese philosophy and religion, two principles, one negative, dark, ... |
| yoga | | A major orthodox system of Hindu philosophy based on Sankhya ... |
| ytterbium | | An element of the rare earth family of metals. It ... |
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