Fig. 6. Relationship between CUC and MP genes. (A) mp seedlings with completely separated (left) and variably fused (middle and right) cotyledons. Note that the size of the cotyledons is unequal in the middle seedling. (B,C) Expression patterns of CUC1 (B) and CUC2 (C) in serial longitudinal sections of mp embryos. CUC1 and CUC2 mRNA was detected using in situ hybridization. Scale bar, 50 µm for B and C. (D) mp cuc1 seedlings. The seedling at the left has cotyledons fused at one side while the seedling at the right has a cup-shaped cotyledon. (E) mp cuc2 seedling with cotyledons fused at one side.