4.2.3.109 epidermis promoter activity is primarily found in the epidermis, cortex, and stele of mature primary and lateral roots, but not in the root meristem or the elongation zone 718231 4.2.3.109 gametophyte - 3777 4.2.3.109 root promoter activity is primarily found in the epidermis, cortex, and stele of mature primary and lateral roots, but not in the root meristem or the elongation zone 718231 4.2.3.109 stele promoter activity is primarily found in the epidermis, cortex, and stele of mature primary and lateral roots, but not in the root meristem or the elongation zone 718231