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Figure 4: (a) Synchronous luminescence spectra of various endogenous fluorophores (b) Synchronous luminescence spectra of normal and oral squamous cell carcinoma tissues (c) Excitation and emission spectra of normal oral tissues for tryptopzhan (d) Excitation and emission spectra of oral squamous cell carcinoma tissues for tryptophan (e) Excitation and emission spectra of normal tissues for collagen (f) Excitation and emission spectra of oral squamous cell carcinoma tissues for collagen and\flavin adenine dinucleotide (g) Scattered plot for tryptophan/collagen intensity ratio (h) Scattered plot for tryptophan/flavin adenine dinucleotide intensity ratio (i) Scattered plot for collagen/flavin adenine dinucleotide intensity ratio

Figure 4: (a) Synchronous luminescence spectra of various endogenous fluorophores (b) Synchronous luminescence spectra of normal and oral squamous cell carcinoma tissues (c) Excitation and emission spectra of normal oral tissues for tryptopzhan (d) Excitation and emission spectra of oral squamous cell carcinoma tissues for tryptophan (e) Excitation and emission spectra of normal tissues for collagen (f) Excitation and emission spectra of oral squamous cell carcinoma tissues for collagen and\flavin adenine dinucleotide (g) Scattered plot for tryptophan/collagen intensity ratio (h) Scattered plot for tryptophan/flavin adenine dinucleotide intensity ratio (i) Scattered plot for collagen/flavin adenine dinucleotide intensity ratio