Fig. 6. Cell proliferation on the various groups for 1, 4, and 7 days (A) without or (B) with visible-light stimulation. (C) ALP activity and (D) calcium deposits of MC3T3-E1 cells after cultured on the different groups for 14 days with or without visible-light stimulation. (E) Immunofluorescence images of MC3T3-E1 cells on the samples' surface to evaluate intracellular Ca²⁺ level using a Ca²⁺-sensitive dye (Fluo-4 AM).