BM	Bone marrow
CFU-F	Colony-forming units of fibroblasts
REL	Relative expression level
O+A+	Bipotent osteo- and adipogenic precursor cells
O+A−	Monopotent osteogenic precursor cells
O−A+	Monopotent adipogenic precursor cells
O−A−	Fibroblast-like cells with high proliferative potential, failed to differentiate toward osteogenic and adipogenic lineages