Fig. 5From: A label-free, fast and high-specificity technique for plant cell wall imaging and composition analysisSRS images of lignin, cellulose, and lipids in xylem cell walls. a–c SRS images of lignin, cellulose, and lipids in the secondary xylem cell walls of poplar, respectively. The white boxes are magnified in d–f. The 3D surface plots are shown in g–i. SX secondary xylem; Scale bars = 50 µm in a–fBack to article page