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Abstract:
In plants and animals, small peptide ligands that signal incell-cell communication have been suggested to be a crucialcomponent of development. A bioassay of single-cell transdifferentationdemonstrates that a dodecapeptide with two hydroxyproline residuesis the functional product of genes from the CLE family, whichincludes CLAVATA3 in Arabidopsis. The dodecapeptide suppressesxylem cell development at a concentration of 1011 M andpromotes cell division. An application, corresponding to all26 Arabidopsis CLE protein family members, of synthetic dodecapeptidesreveals two counteracting signaling pathways involved in stemcell fate.
1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. 2 Biomolecular Characterization Team, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
* These authors contributed equally to this work.
Present address: Department of Life Sciences, Graduate Schoolof Arts and Sciences, The University of Tokyo, Komaba 3-8-1,Meguro-ku, Tokyo 153-8902, Japan.
To whom correspondence should be addressed. E-mail: fukuda{at}biol.s.u-tokyo.ac.jp
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