Oligodendrocyte progenitor cells (OPC) were cultured in the presence of LPC 18:1-Cy5. Proteins interacting with LPC 18:1-Cy5 were UV crossed linked and cell lysates were separated via isoelectric focusing gel electrophoresis. Band was cut out from gel and processed for mass spectrometry. OPC lysates were also incubated with LPC 18:1-micelles and allowed to interact with OPC proteins. Samples were separated using sucrose gradient (Liposome floatation assay), top fraction was collected and processed for mass spectrometry.