2.5.1.148 endoplasmic reticulum - 5783 743340 2.5.1.148 endoplasmic reticulum lycopaoctaene synthase (LOS) activity is localized to a membrane system, possibly the endoplasmic reticulum as is seen for squalene synthase 5783 743340 2.5.1.148 membrane lycopaoctaene synthase (LOS) activity is localized to a membrane system, possibly the endoplasmic reticulum as is seen for squalene synthase 16020 743340 2.5.1.148 microsome - - 743340