Dynamic expression of SMO1 genes during embryo development. A to E, GUS staining of ProSMO1-1:GUS embryos at different developmental stages. F to J, Embryos from ProSMO1-2:GUS transgenic plant. K to O, Embryos from ProSMO1-3:GUS transgenic plant. Bars = 25 μm (A, B, F, G, K, and L), 50 μm (C, D, H, I, and M), and 100 μm (E, J, N, and O).