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The ectodomain of Methuselah (Mth); Mth mutants have a 35% increase in average lifespan and increased resistance to several forms of stress, including heat, starvation, and oxidative damage; The protein affected by this mutation is related to G protein-coupled receptors of the secretin receptor family; Mth, like secretin receptor family members, has a large N-terminal ectodomain, which may constitute the ligand binding site.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",