Fig. 1. In situ localization of E2Fa and DPa mRNA. Hybridization signals are seen as red dots. (A and B) Expression of E2Fa and DPa in the shoot apex of 2-month-old Arabidopsis plants, respectively. (C and D) E2Fa and DPa expression in the longitudinal section through a root meristem of Arabidopsis, respectively. (E and F) E2Fa expression in a longitudinal section through a hypocotyl of 5-day-old light- and dark-grown seedlings of Arabidopsis, respectively. C, cortex; Ep, epidermis; EZ, elongation zone; L, maturing leaf; LP, leaf primordia; Me, mesophyll; P, pith; RM, root meristem; S, stipule; SAM, shoot apical meristem; VT, vascular tissue. Bars = 100 µm (A, B and F) and 50 µm (C–E).