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Full tissue-level changes, including collagen remodeling and disc support, develop over 612 weeks

doi: 10.1038/138032a0

Seiwerth S, Brcic L, Vuletic LB, et al

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The total radioactivity excretion in mixed bile samples collected between 0 and 72 h was low, and tritium water was primarily detected, accounting for 91.2% (females) and 91.0% (males) of the sample