Fig. 1. Birth of peroxisomes in a mouse dendritic cell. Ultra-thin section of a high-pressure frozen D1 cell showing clusters of electron-dense peroxisomes (P) that are often positioned adjacent to a lamella (L). Arrows indicate areas of membrane continuity between the endoplasmic reticulum (ER) and the lamellae (Geuze et al., 2003; Tabak et al., 2003). Bar, 200 nm.