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Limits of detection for peptide standards collected using the OSND capillary, with the peptides consecutively diluted in seawater. Peptide concentrations: (A) 24–38 nM, (B) 2.4–3.8 nM, and (C) 240–380 pM. Peak identities: 1–angiotensin II, 2–angiotensin I, 3–substance P, 4– bombesin, 5–somatostatin, and 6–ACTH (18–39).
