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MS intensity of SDB peak for: serum acid (acid H2S from serum), serum total (total H2S from serum), tris acid (acid H2S from Tris-HCl), and tris total (acid H2S from Tris-HCl). Tris free (free H2S from Tris-HCl), PBA free (free H2S from PB-A), PBB free (free H2S from PB-B), and H2O free (free H2S from H2O).
