Fig. 7From: Super-resolution imaging of Douglas fir xylem cell wall nanostructure using SRRF microscopya Polarised light image showing cell wall layers. Long arrows show lamellae within the S2 layer. Scale bar: 30 μm. b Rhodamine B stained SRRF image of earlywood showing middle lamella (ml) and S2 layer. Scale bar: 30 μmBack to article page