F Purified LAPTM4B N‐termini from (E) were used in PIP strips assay. LPA, lysophosphatidic acid; LPC, lysophosphocholine; PE, phosphatidylethanolamine; PC, phosphatidylcholine; S1P, sphingosine 1‐phosphate; PI3,4,5P3, PtdIns(3,4,5) P3, phosphatidylinositol (3,4,5)‐trisphosphate; PA, phosphatidic acid; PS, phosphatidylserine. 