Scanning electron micrographs of typical cell walls in fractured grapevine callus cells. A) Untreated; B) incubated with H2O2. Scale bars equivalent to 1 μm are indicated in the bottom, right hand corners of the panels. Both samples were equilibrated in 15 mM KCl prior to freeze-fracture.
Pereira et al. BMC Plant Biology 2011 11:106 doi:10.1186/1471-2229-11-106