Figure 4. Pulse-labeling of the lenticular proteome showed the longevity of metabolic enzymes for redox and glycolysis reactions.

Enzymes for energy metabolism and oxidoreduction-detoxification were being measured for their ¹⁴N vs. ¹⁵N abundance in the lens. Marked in red font are proteins that had their ¹⁴N/¹⁵N ratios successfully measured (with their values in parenthesis; followed by a second set of ratios for their nucleus counterparts marked by asterisks).