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Internal phenotype of suc2 mutants. Cross sections of rosette leaves of wild-type (A) and suc2–1 homozygote (B) siblings grown under identical conditions. V indicates vascular bundles. The mesophyll cell chloroplasts of the wild-type leaf (arrows) are small and contain no obvious stored starch. Those of the mutant, however, are large and contain visible starch, indicating that sugars are probably not being efficiently transported out of these leaves.
