(a) Data acquisition and processing procedure; scale bars (from top-left to bottom-right): 1000μm, 100μm, and 10μm. Multi-band Raman images for (b) human skin fibroblasts (scale bar: 20μm) and (c) pig alveolar macrophages (scale bar: 10μm). (d) Reference spectra for linear combination modelling. (e) Single-cell compositional correlation plot and histograms showing fibroblast population distributions; each data point represents a single cell. WT in black, NPC in red. (f) First two PCA loading spectra and PCA score distribution plots (WT in black, NPC in red). (g) Single-cell compositional correlation plot and histograms showing alveolar macrophage population distributions; each data point represents a single cell. Untreated control group in black, drug-treated group in green. (h) First two PCA loading spectra and PCA score distribution plots (untreated in black, drug-treated in green).