Figure 6: Effect of DBT extract prepared from Radix Astragali and Radix Angelicae Sinensis at a ratio of 5 : 1 on osteoclast proliferation and differentiation by (a) MTT assay and (b) TRAP activity assay, respectively, after various concentrations of DBT extract were added for 6 days (proliferative and differentiation phases). Results are expressed as percentage of control ( and versus control).