Fig. 2. Xylem development is severely distorted in the acl5 mutant. (A-H) General anatomy of acl5 and wild-type hypocotyls was examined by light microscopy in transverse sections (A,B,E-H) and in longitudinal sections (C,D) from seedlings grown for seven (A-D), 13 (E,F) or 35 days (G,H). (I) A confocal image of a representative vessel element from wild type. (J) A confocal image of a representative vessel element from acl5. mx, metaxylem; px, protoxylem; sx, secondary xylem; vc, vascular cambium. Scale bars: 50 µm in A-F,H; 100 µm in G.