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. 2012 Apr 18;102(8):1703–1711. doi: 10.1016/j.bpj.2012.02.032

Figure 1.

Figure 1

Both cytosolic and plasma concentrations, x, were listed in HMDB for 33 metabolites. For many metabolites the correlation between cytosol and plasma was good (open circles), but for some metabolites the concentration can differ between cytosol and plasma by more than an order of magnitude (solid circles). We conservatively conclude that plasma concentration data cannot generally be assumed to represent cytosolic concentration.