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Total protein concentrations associated with LEVs stored with and without preservatives at different temperatures. The relative protein concentrations of LEVs and LEVs-TMO stored at (a) −20, (b) 4, (c) 25, and (d) 45 °C for 4 weeks were detected by BCA. Data are presented as mean ± standard error of mean (SEM) (* p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001).
