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Comparisons of different trap columns. Peak area values represent those of albumin 1 (A) and immunoglobulin heavy chain (IG HC) (B) from different volume (5, 7, and 10 µL) multiple reaction monitoring assays of the digested cerebrospinal fluid (CSF) sample (n = 3) using different trap columns (0.3 × 5 mm column and a 3 × 4 mm column).
