2 propanol Article Fragile X syndrome Lipidomics Metabolomics Microdeletion Xq27.3-Xq28 acetonitrile ammonium acetate ammonium formate arachidonic acid ascorbic acid cell culture cell differentiation chloroform chromosome deletion X cytidine phosphate dihydroxyacetone phosphate docosahexaenoic acid electrospray fatty acid analysis female fragile X mental retardation protein gene deletion gene expression glutamine glycerophospholipid glycine human human cell