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age of the plant. This suggests that the phototropin expression levels change with the maturation of the leaves.Mature leaves contain chloroplasts that are essential in photosynthesis. Chloroplast rearrangement occurs in different light environments to maximize photosynthesis. There are several genes involved in plant phototropism including the NPH1 and NPL1 gene. They are both involved in chloroplast rearrangement. The nph1 and npl1 double mutants were found to have reduced phototropic responses. In fact, the two genes are both redundant in

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