jsc2024e071691 (11/5/2024) --- Immunofluorescence staining of a synovial organoid shows CD68+ macrophages (immune cells) in yellow, CD31+ endothelial cells (blood vessels) in red, PDPN+ fibroblasts in green, and nuclei in blue is seen. This image was taken on a confocal microscope and is part of the ICE Cubes #9.4 – Aging in Microgravity investigation. Image courtesy of University of Oxford.