Fig. 4

Representative observed spectra of spores with CaDPA (A) and without CaDPA (B) in the 600 - 1400 cm\(^{-1}\) spectral range. Principal component analysis (PCA) of sodium hypochlorite-treated spores (n=90). The numbering of the spectra corresponds to the numbering of the groups in the PCA plot (C). Untreated control spore, live vegetative cell and a B. thuringiensis spore are also shown on the PCA plot for reference (marked with arrows)