Fig. 1. Effect of RA on cell adhesion in MC3T3-E1 preosteoblasts on Ti surface. Cell adhesion of MC3T3-E1 cells on Ti discs treated with or without 14 µg/ml RA were confirmed via MTT assay. The adhesion rate of MC3T3-E1 cells on Ti discs increased significantly in RA-treated pre-osteoblastic cells. RA: rosmarinic acid, Ti: titanium. *p<0.05, compared to control.