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. 2015 Oct 21;3:168. doi: 10.3389/fbioe.2015.00168

Figure 1.

Figure 1

Metabolic challenges cells have to deal with. Many metabolic reactions are characterized by low productivity and product yield for the following reasons: accumulation of toxic and/or unstable intermediates, loss of intermediates due to diffusion into the bulk phase (long distances between interacting proteins), and competing pathways (metabolic interference) also leading to undesirable side reactions.