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(a) Principal component analysis (PCA) scores (component 1 versus component 2) of serum metabolites derived from sham rats (■), CIA rats (▲), and castrated CIA rats (●). The 3 groups were clearly separated. (b) Principal component analysis (PCA) scores (component 1 versus component 2) of serum metabolites derived from sham rats (■), castrated CIA rats (●), and castrated CIA rats treated with YJB (▲). A clear separation of the score spot was observed in the three groups.
