Phosphatidylserine (PS) is a negatively charged phospholipid that displays a highly uneven distribution within cellular membranes. essential for establishment of cell polarity and other processes. In this review. we discuss how combined action of PS biosynthesis enzymes in the endoplasmic reticulum (ER). https://www.roneverhart.com/William-Tuttle-Hair-White-Color-Foundation-6g/