GBA1 and Parkinson disease: It focused on GlcCer in non-GBA1-associated PD, but it would have been valuable to include some confirmed GBA1 mutant patients and GBA1-mutant mice for comparison as “positive” control, particularly because we did not find quantifiable glucosylsphingosine species in our lipidomic analysis, which are supposed to be biomarkers for Gaucher disease.