Fig. 5From: Super-resolution imaging of Douglas fir xylem cell wall nanostructure using SRRF microscopya Brightfield transmission image of rhodamine B stained latewood. b Single confocal slice image. c Average intensity projection of 100 confocal slices. d SRRF image. The SRRF image differentiates the middle lamella (ml) and a wide layer between the two short arrows that may include both the S1 layer and primary cell wall, 1–1.5 μm wide. Scale bars: 10 μmBack to article page