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Representative chromatograms of 100 pg/sample extracted 5 and 6 standards (A), and mouse brain cell homogenates (B). Upper trace, 2.4 pg/sample 5 (m/z 504.6/218.2); middle trace, 6 (m/z 490.4/472.4) and lower trace, 6 (m/z 490.4/204.2) with 39 pg/sample.
