L. Quantification of the content of ALA in midguts of 14-day, 26-day, and 40-day flies using LC-ESI-MS/MS. Error bars indicate the SD of three 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. 