Fig. 1. The concentrations of plasma-free metanephrine (open) and normetanephrine (closed) at room temperature (A), 4℃ (B), –20℃ (C), and –80℃ (D).

Lab Med Qual Assur 2023;45:34~41 https://doi.org/10.15263/jlmqa.2023.45.1.34

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