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Chromatograms of histamine (HI) and norepinephrine (NE) in fur seals. (A,B) Typical chromatograms displaying the level of HI and NE in dialysates collected during bilaterally symmetrical EEG states in fur seals. AW, active waking; QW, quiet waking; BSWS, bilateral slow wave sleep; REM, rapid eye movement sleep. HI eluted at a retention time of ∼16 min and NA eluted at a retention time of ∼8.9 min.
