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[ Sen. 4, subscore: 2.00 ]: Using transformants carrying the QHB promoter-GUS and in situ hybridization , we found that QHB was specifically expressed in the central cells of a quiescent center ( QC ) of the root .
[ Sen. 3, subscore: 1.00 ]: To investigate this possibility , we isolated and characterized a rice WUS-type homeobox gene designated quiescent-center-specific homeobox ( QHB ) gene .
[ Sen. 5, subscore: 1.00 ]: During embryogenesis and crown root formation , QHB expression was observed prior to the morphological differentiation of the root .
[ Sen. 6, subscore: 1.00 ]: However , we detected different QHB expression patterns in the process of the RAM development , specifically between radicle and crown root formation , suggesting that the cell-fate determination of the QC may be controlled by different mechanisms .
[ Sen. 7, subscore: 1.00 ]: We also produced transformants that overexpress QHB or Arabidopsis WUS .
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