Oligodendrocyte Precursor Cells (IMAGE) Cold Spring Harbor Laboratory Caption Oligodendrocyte Precursor Cells, or OPCs (the purple and green blobs above), prune unneeded synapses (the silver streaks) in the brain’s visual cortex in response to new information and experiences. Credit Cheadle lab/Cold Spring Harbor Laboratory Usage Restrictions Attribution required License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.