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. 2021 Mar 16;12:638003. doi: 10.3389/fmicb.2021.638003

Figure 2.

Figure 2

The mechanism of microbial nanoparticle synthesis. The intracellular synthesis includes various enzymes, reducing molecules, chelating agents, and metal binding proteins present within the cell, while the extracellular synthesis involves secreted enzymes, surface enzymes, proteins, and reducing agents.