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Proposed molecular mechanism underlying PF-induced attenuation of virulence and inhibition of biofilm formation in S. suis. (a) The circle is the methyl cycle pathway, the dashed frame is the pathway where the signal molecule AI-2 is generated. (b) The dashed box on the left is a diagram of the mechanism of PF affecting the formation of signaling molecule AI-2, and the dashed box on the right is a diagram of the mechanism of normal AI-2 signaling molecule formation
