. 2020 Jul 13;10(7):287. doi: 10.3390/metabo10070287

Table 1.

Ratios $\frac{l a b e l e d}{e n d o g e n o u s}$ of ¹³C-labeled metabolite versus endogenous (all ¹²C) metabolite under baseline conditions using perfusion with Ringer’s solution containing 1 mM ¹³C₄-succinate (all 4 C-atoms ¹³C-labeled).

Metabolite	Labeling Ratio
Isocitrate (4 ¹³C, 2 ¹²C)	0.09
Lactate (3 ¹³C)	0.0029
Fumarate (4 ¹³C)	9.64
Pyruvate (3 ¹³C)	0.06
Malate (4 ¹³C)	11.43