Expression of OsMADS1 and OsMADS6 in wild-type and mfs1-1 flowers. A to D, OsMADS1 expression in wild-type flowers. E to H, OsMADS1 expression in mfs1-1 flowers. I to L OsMADS6 expression in wild-type flowers. M to P, OsMADS6 expression in 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; fm, floral meristem; le, lemma; lo, lodicule; pa, palea; pal, palea-like organ; pi, pistil. Bars = 50 μm.