B. Quantification of the luciferase activity of flies with indicated ages and ALA administration. Error bars show the standard deviation (SD) of six independent experiments. Data information: Error bars represent SDs. Student's t-tests, *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001, and non-significant (NS) represents p > 0.05. 