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(a) The PCA results of ATCC 25922 metabolites under different GO concentrations incubation. 1 represents the control group with GO and 2–6 principal components are from the ATCC 25922 samples incubated with GO concentrations at 5, 20, 40, 80 and 120 μg/mL for 2 h respectively. (b) shows the relationship between GO concentration and the parameter D as well as the cell viability rate of ATCC 25922 calculated by colony method.
