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Raman spectra in protein-derived spectral regions from dentin and the DEJ at occlusal positions (A) and at cervical positions (B); representative Raman image of the DEJ based on intensity ratios of amide I/1450 at occlusal positions (C) and at cervical positions (D); representative Raman image of the DEJ based on intensity ratios of amide III/1450 at occlusal positions (E) and at cervical positions (F).
