POU5F1 and infection: Correlation with cellular aggregates found by immunohistochemistry on retinectomized tissue due to proliferative vitreoretinopathy (PVR) caused by RD was performed to determine presence of markers for microglia (CD34), macrophages and activated microglia (CD68), regulator of the immune response to infection (NFkB), progenitor and stem cell marker (Sox2), pluripotency marker (Oct4) and intermediate filament markers (GFAP and Nestin).