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Principal component analysis (PCA) biplots (PC1 versus PC2) of the digesta of tilapia protein and its hydrolysates based on their α-amino group content and chemical and cellular antioxidant activities. Cytoprotection (0.1 or 2.0) and cellular antioxidant activity (CAA) (0.1, 0.5, or 5.0) indicated the activities of the digesta at concentrations specified in parentheses in mg/mL.
