Figure 2

(a) Variation in the autofluorescence spectrum of the dorsal part of E. verrucosus among different individuals. (b) Spectra of protonated SNARF-1 (microencapsulated, at pH 2), deprotonated SNARF-1 (microencapsulated, at pH 8.9) and autofluorescence of E. verrucosus used as standards for spectral decomposition with multiple linear regression. The dashed lines show the range used for spectral decomposition.