Kaiin, E.M. et al. 2018. Biological Analysis of Leydig Cells-Conditioned Medium to Support Rat Bone Marrow Mesenchymal Stem Cells Differentiation. Annales Bogorienses. 22, 1 (Jun. 2018), 20–26. DOI:https://doi.org/10.14203/ann.bogor.2018.v22.n1.20-26.