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Evaluation of SPE columns from Supelco (open square), Waters (open triangle), Isolute (closed circle), and Phenomenex (x) on the recoveries of PEA, SEA, OEA, and LEA (top row, left to right) and AEA, EPEA, DHEA, and 2-AG (bottom row, left to right; values are mean with SEM, n = 5).
