Expression of the DL gene in wild-type and mfs1-1 flowers. A to D, Wild-type flowers. E to H, mfs1-1 flowers. Columns 1 to 3 show longitudinal sections of flowers at stages Sp4 to Sp7, and column 4 shows transverse sections of flowers at stage Sp8. el, Extra lemma-like organ; le, lemma; pa, palea; pal, palea-like organ; pi, pistil; vb, vascular bundle. Bars = 50 μm.