GUS expression in inflorescences and SAMs of the wild-type, CLV3Thr6 transgenic, and clv3-2 plants carrying pCLV3::GUS. A, GUS expression in inflorescences. Compared with the wild type (left), extended GUS expression were observed in flower buds of CLV3Thr6 transgenic plants (center), as in clv3-2 (right). Pictures were taken under a dissection microscope. Bars = 3 mm. B, GUS expression in SAMs. Compared with the wild type (left), the GUS expression domain was significantly enlarged in the SAM of CLV3Thr6 transgenic plants (center), similar to clv3-2 (right). Pictures were taken under a DIC microscope after clearing. Bars = 150 µm.