Fig. 3
From: Unmethyl-esterified homogalacturonan and extensins seal Arabidopsis graft union
SEM images of cells from graft union. a – callus cells (c) without bead-like structures, fibrillar material associated with some of them (arrow). b – graft union, bead-like structures on the surface of the cells that are not covered with a membranous structure (asterisk). c and d – bead-like structures on the cell surface (arrows), arrowhead – fibrillar material associated with some of the bead-like structures. e – two types of bead-like structures found: “closed” (arrowheads) and larger, “open” (arrows) ones. f – magnification of an “open” bead-like structure". sc scion