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Fig. 5. Action of the CLV pathway on the WUS promoter. (A-F) Light micrographs of live plants. (A) Wild-type seedling 1 week after germination. The first true leaves (arrow) are visible between the cotyledons (c). (B,C) wus-1 mutant (B) and CLV1::CLV3-expressing (C) seedlings one week after germination. No leaves are visible between the cotyledons (arrow), indicating a defective SAM. (D) Terminated inflorescence of a CLV1::CLV3-expressing plant. (E,F) CLV1::WUS (E)- and CLV1::WUS; CLV1::CLV3 (F)-expressing seedlings 12 days after germination. In both cases, the meristem is considerably enlarged (arrow) compared to wild type. Scale bars: 1 mm.