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Fig. 1. SUF4 is required for the late-flowering phenotype of
FRI and is alternatively spliced. (A,B) The effect
of suf4 mutations on flowering time in the indicated genetic
backgrounds. (A) Plants were photographed at similar stages of development
(e.g. at the opening of the first flowers). (B) Bars represent the total
number of leaves (rosette and cauline) formed by the primary shoot apical
meristem. Black and gray bars represent plants grown under long days; white
and cross-hatched bars represent plants grown under short days. Plants
represented by gray and cross-hatched bars were cold-treated for 30 days
before planting. Error bars represent the s.d. (C) Genomic structure of
SUF4. Exons are indicated by open boxes; filled circles indicate
sites of alternative splicing. (D) RT-PCR of SUF4 and a
schematic drawing of the three splice variants of SUF4.
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