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Average intensity of the Ramen spectra (wave numbers 750–1800 cm−1) in A, non-osteoarthritis (non-OA) (purple) versus OA (orange) tibial specimens (difference shown in black), and in B, non-OA medial (black) versus non-OA lateral (blue) compartments, and OA medial (green) versus OA lateral (red) compartments.
