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Stable isotope composition of blood plasma from five healthy individuals (blue circles) and three metastatic breast cancer patients (red circles), including δ65Cu (A), δ56Fe (B), δ66Zn (C), and δ56Fe compared to Fe concentration (D). Samples 9 and 10 were collected from the same patient at different timepoints, with the latter taken when the patient had substantial diarrhea
