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Temporal profiles of GABA content and pH during fermentation. Uppercase letters (A–E) and lowercase letters (a–e) indicate significant differences (p < 0.05) among means within their respective data groups by Duncan’s multiple range test. For each letter system, the letter ’A’ (or ’a’) denotes the highest mean value, followed by subsequent letters (B, C, D, E / b, c, d, e) in decreasing order. Letters are not comparable between the two systems.
