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HPLC radioactivity trace (relative response of detector in mV) versus elution time (min). A: Plasma unesterified fatty acids extracted from baseline (0 min), spiked with [1-11C]DHA. B: Plasma unesterified fatty acids collected 10 min postinfusion of [1-11C]DHA. Absorbance (192 nm) traces for A and B are not shown. The arrow represents an unknown peak (see text).
