Promoter activity and protein fusions of PLT homologues display gradient distributions with maxima in the stem cell area.PLT activities are largely additive and dosage dependent.

• 本文中我们把根系形成必需的四种PLT同源族用进化枝表示出来，启动子活性及PLT蛋白融合显示出在干细胞上最大的坡度分布。