Biosynthetic and catabolic pathways control amino acid δ²H values in aerobic heterotrophs.

Independent measurements of the derivative reagent δ 2 H values are possible in some cases, but without accompanying correction for the amine-bound hydrogen in derivatized amino acids, errors in the reported δ 2 H values of amino acid carbon-bound hydrogen may be significant (on the order of 10 to 100‰; Supplementary Figure S7 ; Supplementary Section 4 ).

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