ACL5 expression is associated with provascular/procambial cells. A to H, Sections were hybridized with sense (B, D, F, H) and antisense (A, C, E, G) DIG-labeled ACL5 RNA probe. A and B, Longitudinal sections through globular-staged embryos. Scale bars = 12.5 μm. C and D, Longitudinal sections through leaf primordia of week-old seedlings. Scale bars = 50 μm. E and F, Longitudinal sections through root of week-old seedlings. Scale bars = 25 μm. Note the DIG-labeled vasculature. G and H, Transverse sections through root of week-old seedlings. Scale bars = 25 μm.