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senescence × 118human-biology × 17
telomere × 13
genetics × 12
evolution × 12
dna × 11
cell-biology × 10
life-history × 10
life × 7
cancer × 6
molecular-biology × 5
neuroscience × 5
plant-physiology × 5
pharmacology × 5
zoology × 4
botany × 4
physiology × 4
reproduction × 4
natural-selection × 4
health × 4
death × 4
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biochemistry × 3
mutations × 3
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