Endrinaldi, E., Ali, H., Tofrizal, T., Asterina, A., Elmatris, E. and Yarni, S.D. 2022. Optimization of the Duration of the Administration of Mesenchymal Stem Cells Wharton’s Jelly to the Level of Matrix Metalloproteinase-1 and Transforming Growth Factor-β in Osteoarthritis Rat Model. Open Access Macedonian Journal of Medical Sciences. 10, A (Mar. 2022), 563–571. DOI:https://doi.org/10.3889/oamjms.2022.8838.