After incubation of azido-Ala to HEK293/GS M4 cells for 20 h, cells were subjected to the following stimulus: (A) glucose starvation with antimycin A in a time-dependent manner, (B) glucose starvation with an increasing concentration of antimycin A, (C) decreasing glucose concentrations with antimycin A, and (D) increasing incubation time of antimycin A in a physiological glucose concentration (5 mM). After stimulus, cell lysates were subjected to click reaction with rhodamine-alkyne, and analyzed for fluorescence and Coomassie stain.