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Name of the institutional approval committee: Bundang CHA Hospital, CHA University, Republic of Korea (3). Approval number: CHAMC 2021-03-016-006 (4). Date of approval: April 1st, 2022. Written informed consent for tonsil tissue was obtained from the parents of the children.Consent of the Committee on the Ethics of Animal Experiments of the Local Ethics Commission: (1) Title of the approved project: Bone and cartilage regeneration experiments for spine and disc diseases (2). Name of the institutional approval committee: the Institutional Animal Care and Use Committee (IACUC) of CHA Bundang Medical Center, CHA University, Republic of Korea (3). Approval Number: IACUC-230180 (4). Date of approval: November 1st, 2023. 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