Fig. 2From: Super-resolution imaging of Douglas fir xylem cell wall nanostructure using SRRF microscopyMeasurement of margo fibrils by autofluorescence SRRF indicates a thickness range of 70–120 nm. a Pit membranes in transverse view showing margo (m) and torus (t). b Enlarged view of a. The distance between the arrows is 70 nm. Scale bar: 10 μm. Intensity scale: 0–255Back to article page