= Phototropin
A <phototropin> is a blue-light-responsive <receptor> with kinase activity that regulates responses including <phototropism>, <chloroplast> relocation and stomatal opening. <Light> <perception> changes intracellular regulation, which in turn alters movement or growth.
<Mutants> defective in the <chloroplast> high-light avoidance response identified a <phototropin> homologue required for that response. Comparing movement under strong and weak <light> helps separate avoidance from the different response of positioning <chloroplasts> to capture <light>.<Arabidopsis NPL1: a phototropin homolog controlling the chloroplast high-light avoidance response by Takatoshi Kagawa and others>[2001, pp. 2138–2141]{ref}
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