Fig. 2
From: Unmethyl-esterified homogalacturonan and extensins seal Arabidopsis graft union
SEM images of graft union. a and b – some of the callus cells from the graft union covered with a membranous structure (arrows) and some covered with a fibrillar material (arrowheads). c and d – the graft union enveloped with a membranous structure (arrows), arrowhead – cell not covered with a membranous structure, visible bead-like structures on the surface. e – net-like structure formed from the fibrillar material (arrows). f – membranous structure (asterisk) that covers the graft union cells. Dag days after grafting