Fig. 5: Attributions of the primary Raman peaks and the chemical imaging analysis of the LC, CC, and ML.

a Attributions of the main peaks in the Raman spectra of the LC, CC, and ML. vw is very weak; w is weak; m is medium; s is strong; and vs is very strong. b Raman chemical images generated based on the hyperspectral data by integrating over the marker band regions of different components and functional groups. Scale bar: 20 μm