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. 2017 Oct 12;5:e3860. doi: 10.7717/peerj.3860

Figure 5. Optimal choice of pathways: example of an optimal-efficiency-PEM that is neither a sustainability nor a producibility-PEM.

Figure 5

In the Synecchocystis network, the production of Putrecine is assured by a pathway initiated in L-arginine at the expense of a direct alternative pathway from extra-cellular Putrecine. One interpretation is that the L-arginine pathway also allows the production of Ammonia. In this context, urea and agmathine are optimal-efficiency-PEMs but neither sustainability-PEMs nor producibility-PEMs.