Threonine nitrogen isotopes reveal hidden physiological dimensions of mammalian ecology

Stable nitrogen isotopes of amino acids are widely used to reconstruct trophic position. Most applications rely on only two amino acids despite routinely measuring many others. Here, comparative amino acid {delta}15N values from 88 mammal species reveal that threonine records a physiological dimension beyond trophic position. Adding threonine to the canonical glutamate-phenylalanine framework…

biorxiv.org ·22h ago

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