Figure 7

Detailed view of the Raman spectral regions between 650 and 750 cm⁻¹ and between fingerprint region between 950 and 1500 cm⁻¹ of the combined hierarchical 4 cluster analysis shown in Fig. 6. The spectra from the feature body and core (orange and red) are shifted up to allow better comparison with the spectra from the surrounding tissue (grey). The main changes are indicated with arrows, black arrows indicate Raman bands disappearing in the feature regions and red arrows indicate Raman bands appearing in the features. A Raman spectra from the grey matter of a normal human brain¹³ is shown below for comparison.