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This Week in Science
The hormone cytokinin regulates a variety of aspects of plant growth and physiology. Kakimoto (p. 982) identified a gene affected in cytokinin-independent mutants of Arabidopsis. The gene CKI1 encodes a protein similar to those in the two-component signal transduction systems of bacteria that may act in cytokinin recognition or regulation.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)