Figure 2. H1 eviction marks the somatic-to-reproductive fate transition in Arabidopsis ovule primordia. H1.1-GFP (green) is present in all nucellar cells of the ovule primordium but is evicted upon differentiation of megaspore mother cells (MMC). This image shows an ago9–4 ovule primordium producing ectopic cells engaged in an ameiotic gametophytic fate,⁶⁴ showing H1 eviction like wild type MMCs. Scale bar: 10 µm. Courtesy of C. Baroux (Zurich, Switzerland).