Additional studies in Drosophila added further interesting information. As said, SWS mutants show vacuolization and degeneration of neurites. This could be reversed by murine NTE, indicating that the mouse protein (and most likely the human NTE protein, which is 96% identical to the murine one) is a true functional ortholog of fly SWS [106]. In Drosophila, SWS is expressed in neurons and to a minor extent in glia, and is localized in the endoplasmic reticulum; a similar distribution had been found for NTE in mouse brain, though no NTE had been detected in glia [106] and [107]. Phosphatidylcholine levels were increased in SWS mutants, substantiating the role of SWS/NTE in its hydrolysis [99], and in the regulation of normal lipid composition in the CNS [106].