Cell specific localization of ZmMET1 mRNA in maize root apex and leaf sheath node edge regions. In situ hybridization of ZmMET1 transcripts was performed with digoxigenin-UTP labeled ZmMET1 anti-sense (A, C, D, E, F, G) or sense (B) probes. Samples are from longitudinal sections of a 10 day old root apex (A, B); close-up of (A) showing the root cap and initials of procambium, epidermis and cortex (C); transversal sections of the leaf sheath node region (D); close-up of (D) showing leaf the primordium (E, F); longitudinal section of the leaf sheath node region (G). sa, shoot apex; lp, leaf primordia; co, coleoptile; pm, potential metaxylem; pt, protoderm; rx, radicle cortex; iec, initials of the epidermis and cortex; rc; root cap. Bars are 250 µm.