Figure 3.

(a) The five different cellular compartments can be distinguished by sets of Raman intensities at selected wavenumbers determined by an information-based approach (for more details, see text). The average spectrum of each respective compartment is shown together with its characteristic barcode. The broad band observed at ∼1100 cm⁻¹ originates from the glass substrate, and the one at 1600 cm⁻¹ originates from the buffer solution (PBS). (b) The curves show the difference between the average spectra of the organelles displayed in panel a. The corresponding barcodes have also been included for the sake of clarity. (In color online.)