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We identified three novel, highly homologous, sensor histidine kinases that possibly function in the plasma membrane of Arabidopsis thaliana, i.e. AHK2, 3 and 4. While AHK2 and 3 are expressed in several organs, AHK4 is mainly expressed in roots. AHK3 suppresses a sensor histidine kinase mutant of yeast.
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Ueguchi et al. (2001) studied this question.
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