Changes in the 10 most abundant Phosphatidylcholine (PC) (A, B) and Phosphatidylethanolamine (PE) (C, D) species, measured with mass spectrometry, in the MAM fraction after 24-hour exposure to either thapsigargin or palmitate. All the lipid species were first normalized to internal standard of each sample and then the normalized signals were summed together (within a treatment) for PC and PE species separately, the percentages were calculated for each lipid species using the sum of all the species as 100%. One-way ANOVAS with Bonferroni multiple comparisons were run within every lipid species (n=6), significances are as follows * p<0.05, ** p<0.01, ***p<0.005, ****p<0.001.