Figure 4 TLC separation and identification of some lipids bound to HDL. Following incubation with RPE cells fed ¹⁴C labelled POS, HDL bound lipids were extracted and separated by TLC (bottom of plate at the left). Standards for pure phosphatidyl choline (PC), phosphatidyl inosotol (PI), phosphatidyl ethanolamine (PE), and cholesterol (C) were run, as well as triglyceride rich lipids (TRL) which contains triglycerides (TG) and cholesterol esters (CE) were run.