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. 2022 Jan 1;12(2):542–557. doi: 10.7150/thno.64340

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(A)-(C) PA spectra of different damaged cartilage (least damaged, medium damaged and most damaged) at 500 nm- 700 nm. (D)-(F) PA spectra of different damaged cartilage (least damaged, medium damaged and most damaged) at 710 nm- 1300 nm. Figures adapted with permission from Ref. 99. Copyright © 1969, Elsevier (1969).