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Concentrations of d-amino acids of d-aspartic acid (d-Asp), d-glutamic acid (d-Glu), d-serine (d-Ser), and d-alanine (d-Ala) (Exp I [A] or II [C]) and a percentage of each respective d-amino acid in relation to total amino acids (d + l) for d-Asp, d-Glu, d-Ser, and d-Ala (Exp I [B] or II [D]) during incubation experiments.
